You are interested in studying position effect variegation in Drosophila using the chromosome depicted below: Deactivation of the w+ gene gives a white eye phenotype and deactivation of the rst+ gene gives a rough eye phenotype; the normal phenotypes are red and smooth. Because the rst+ and w+ genes have now been placed close to a heterochromatic domain, some sections (or sectors) of the eye display mutant phenotypes due to gene deactivation while others display the normal, wild type phenotype. Which phenotype would you not expect to see rst w Inverted X chromosome white smooth eye sectors white rough eye sectors red smooth eye sectors red rough eye sectors
Q: What is the difference between a maternal-effect gene and a zygotic gene? Of the following genes…
A: Genes are the basic biological unit of heredity. They are a segment of deoxyribonucleic acid (DNA)…
Q: Which of the following depicts an epigenetic change? i. Green, variegated and albino Agave plants…
A: Changes in gene expression that are passed down to cells or future generations but do not involve…
Q: In an investigation using Drosophila, an undergraduate student successfully described 2 new genes…
A: Recombination frequency is a measure of intensity of linkage between two genes. For any two genes,…
Q: a. In which sex, XY males or XX females, would the Sxl protein bind to the msl-2 mRNA? b. As…
A: Drosophila sex determination and dosage compensation are primarily controlled by two distinct sets…
Q: An undergraduate researcher in your lab is studying mutations affecting the wings of Drosophila…
A: Alleles of homozygous bent-winged fly which possesses the normal allele of apterous: ap+be, apbe…
Q: Which of the following conditions are required for the Eve protein to be expressed in the cells that…
A: Apoptosis is defined as a form or type of programmed cell death that will occur in multicellular…
Q: In Drosophila melanogaster, black body (b) is recessive to gray body (b+), purple eyes (pr) are…
A: Introduction Drosophila Comes From The Word Drosos, Which Means "Love Of Dew." They Are Members Of…
Q: Diseases which are caused by recessive variants in loci located on the X chromosome affect females…
A: ( Comment: As per the guidelines,we are allowed to answer one question at a time, so repost second…
Q: n Drosophila, one of the genes controlling wing length is located on the X chromosome. A recessive…
A: 1. Male with miniature wing, red eye. Female with Normal wing, red eye. 2. Phenotypes on…
Q: You are mapping three linked loci in Drosophila melanogaster (the common laboratory fruit fly). You…
A: The fruit fly Drosophila is commonly associated with genetics due to the dominance of post-Mendelian…
Q: In considering the formation of the A–P and D–V axes in Drosophila, we noted that, for mutations…
A: Maternal effect genes are the ones that are contributed to the egg by females.
Q: Anthocyanin is a pigment that gives flowers and leaves purple colors. The M gene codes for a…
A: 1) In the question it is given that anthocyanin is the pigment responsible for expression of…
Q: Fruit flies express both normal wing shape and vestigial wing shape. The pedigree shows the…
A: Introduction :- Vestigial organs are organs that have no obvious function and are thought to be…
Q: Has the DNA sequence of the eye color gene been changed in part (b) compared with part (a)? How do…
A: before we could address the q, lets understand a few terms. 1.heterochromatin: a compressed form f…
Q: In Drosophila, a female fly is heterozygous for three mutations, Bar eyes (B), miniature wings (m),…
A: In terms of genetics and genomics, linkage describes how closely genes or other DNA sequences are…
Q: What changes, if any, would you predict would occur in the pigmentation of Drosophila melanogaster…
A: The relatively simple morphological trait that helps in the mapping of the genetic basis of…
Q: In Drosophila melanogaster many eye color mutations are known. One such recessive mutation is called…
A: Drosophila melanogaster is a fly species in the Drosophilidae family (taxonomic order Diptera). The…
Q: bw cn st + b. W + n + cn + se С. W bw cn ; st se bw cn st se d. W bw + st se + cn st se +
A: In the eyes of the fly “Drosophila”, pigments of various colors are seen. Two different pathways…
Q: In Drosophila melanogaster, curled wings (cu) was one of the first mutants described by
A: Genetics is a part of biology that deals with the transmission of characteristics from one…
Q: In Drosophila melanogaster, black body (b) is recessive to gray body (b*), purple eyes (pr) are…
A: Answer:
Q: • Describe what it means that a strain of Drosophila is wild-type for a particular character.…
A: Wild type Strain- it means an individual has a normal phenotype which is generally found in the…
Q: Drosophila geneticists made the first genetic maps. They claimed that the gene loci that they mapped…
A: Genetic map is the one that gives the probable location of genes on a chromosome. A genetic map is…
Q: The fly with vestigial wings shown in the lower-left corner of Figure is crossed with the fly with…
A: A vestigial fly has hereditarily mutated wings. They have crumpled wings which keep them from having…
Q: Suppose a geneticist uses a three-point testcross to map three linked Drosophila recessive mutations…
A: The Answer is - f b z
Q: Construct a genetic map using the following data: A line of drosophila has been constructed with…
A: Genetic mapping is also known as linkage mapping. It is used to identify the distance between genes…
Q: In Drosophila, the following genes and mutations are known: Wingsize – recessive allele for tiny…
A: Alleles are the alternative form of gene that are located on the same locus of homologous chromosome…
Q: Human females who are heterozygous for an X-linked recessive allele sometimes exhibit mild…
A: Gene is a functional unit of heredity. A gene is a sequence of nucleotides in genome that codes for…
Q: In tomato plants, the genes for fruit colour (C), fruit fructose content (F), fruit length (L), and…
A: If multiple genes are located on the same chromosome then they are called linked genes and they…
Q: Scarlet (S), cream (Cr), and maroon (M) are three genes located on chromosome 3 of Drosophila…
A: ANSWER;-The distances between each pair of genes (S), (Cr), and (M)
Q: explain Position-effect variegation in Drosophila?
A: Mutation is defined as the permanent change or alterations happening in the sequence of the DNA of…
Q: White eyes in Drosophila melanogaster result from an X-linked recessive mutation. Occasionally,…
A: The transposable elements are the DNA sequence that may change its position or location within the…
Q: The beach mouse (Peromyscus polionotus) is a small rodent found in the southeastern United States.…
A: Introduction An organism's genotype is made up of all of its genetic components. The alleles or…
Q: In Drosophila melanogaster, black body (b) is recessive to gray body (b+), purple eyes (pr) are…
A: For double crossover - 4 flies As b+ pr+ vg+ and b pr vg For single cross between b and pr - 56…
Q: Drosophila can have 1, 2, or 3 stripes on their body. From previous experiments, you suspect that…
A: Introduction Drosophila melanogaster is a species of fly in the family Drosophilidae. The species is…
Q: The mutations called bobbed in Drosophila result from variable reductions (deletions) in the number…
A: Mutations known as bobbed results from varied deletions in the number of amplified rRNA coding…
Q: The beach mouse (Peromyscus polionotus) is a small rodent found in the southeastern United States.…
A: The average number of offspring per parent of a specific kind can be used to calculate absolute…
Q: A peculiar eye condition known as "star” is manifested as a dominant gene in Drosophila. Its…
A: introduction Drosophila melanogaster is a types of fly (the ordered request Diptera) in the…
Q: 1. In Drosophila melanogaster (fruit fly) experiment, if we are going to cross male and female…
A: There are 2 categories of chromosomes: sex chromosomes and autosomes. The rules of inheritance with…
Q: Using Drosophila notation: A.) Diagram the genotype of a female fly that is recessive for apterus…
A: Homozygous means both the alleles will be same and heterozygous means both the alleles will be…
Q: In Drosophila, three loci, Bar eyes (B, dominant), Scalloped wings (sd, recessive), and tan body (t,…
A: If the genes are located on the same chromosome then they do not allow crossing over between them.…
Q: Researchers have exploited Minute mutations in orderto study the phenotypes associated with…
A: The mutation is change or damage in the sequence of the genome or deoxyribonucleic acid (DNA). The…
Q: In Drosophila melanogaster, black body (b) is recessive to gray body (b"), purple eyes (pr) are…
A: Crossover interference can be defined as the non-random placement of crossovers with respect to each…
Q: Which Position-effect variegation in Drosophila?
A: Drosophila are known as the fruit flies that are importantly used as a model organism in the genomic…
Q: __i___ sex chromosome is present in male Drosophila and ___ii___ sex chromosome is found in female…
A: Drosophila is a fruit fly that belongs to the class Insecta and Phylum Arthropoda. It is one of the…
Q: Consider the following variations in Drosophila melanogaster, relative to the wild-type: White eyes…
A: a) White eyes is a recessive trait and it's gene is found on chromosome number 1 So, the genotype of…
Q: The genes dumpy wings (dp), clot eyes (cl), and apterous wings (ap) are linked on chromosome II of…
A: A genetic map is a type of chromosome map that shows the relative locations of genes and other…
Q: a mutant screen in Drosophila, you identified a gene related to memory, as evidenced by the…
A: Recombination is a crucial term in biology. It is necessary for the creation of gene variants. The…
Q: Scarlet (S), cream (Cr), and maroon (M) are three genes located on chromosome 3 of Drosophila…
A: By finding recombination frequencies for many gene pairs, we can make linkage maps that show the…
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- The locations of six deletions have been mapped to a Drosophila chromosome, as shown in the following deletion map. Recessive mutations a, b, c, d, e, and f are known to be located in the same region as the deletions, but the order of the mutations on the chromosome is not known. (refer image for contination )The locations of six deletions have been mapped to a Drosophila chromosome, as shown in the following deletion map. Recessive mutations a, b, c, d, e, and f are known to be located in the same region as the deletions, but the order of the mutations on the chromosome is not known.Consider the following variations in Drosophila melanogaster, relative to the wild-type: White eyes are a recessive trait—the gene of which is found in Chromosome I (X). Vestigial wings are a recessive trait—the gene of which is found in Chromosome II. Aristapedia is a dominant trait—the gene of which is found in Chromosome III. Being homozygous for this condition is lethal. Cross the following mutant females with a wild-type (homozygous) male. Show the Punnett square and obtain the genotypic and phenotypic ratios of the first filial generation (F1). Female with white eyes Q4: Show the Punnett squares and obtain the genotypic and phenotypic ratios of the first filial generation (F1) and second filial generation (F2) of the following crosses. Note: The F2 generation can be obtained by crossing one male and one female from the F1 generation. Female with white eyes and vestigial wings and wild-type male
- The cystic fibrosis gene encodes a chloride channel protein necessary for normal cellular functions. Let us assume that if at least 5% normal channels are present, the affected individual has mild symptoms of cystic fibrosis. Having less than 5% normal channels produces severe symptoms. At least 50% of the channels must be expressed for the individual to be phenotypically normal. This gene has various mutant recessive alleles: Predict the percent of functional channels and severity of symptoms for the following genotypes: a. heterozygous for CF100 b. homozygous for CF100 c. heterozygous, with one copy of CF100 and one of CF3 d. heterozygous, with one copy of CF1 and one copy of CF3Researchers have exploited Minute mutations in orderto study the phenotypes associated with recessive lethal mutations (l−) that decrease the rate of cell divisionand thus make only very tiny homozygous mutant clones that are difficult to analyze. Many differentstrains of Drosophila carry dominant loss-of-functionMinute (M) mutations in a variety of genes encodingribosomal protein subunits. The M genes are haploinsufficient; flies with only one wild-type M+ gene copyhave a slower pace of cell division, and thus prolongeddevelopment and subtle morphological abnormalities.To circumvent the tiny clone problem, researchersgenerate GFP-marked homozygous l−/ l− clones thatare also M+/ M+, in flies that are l−/ l+ and M−/ M+.The loss of the Minute mutation only in cells withinthe clone gives the l−/ l− cells a growth advantageover their neighbors, enabling the mutant clone togrow large enough to study. Diagram chromosomesthat could be used to generate such clonesIn Drosophila, one of the genes controlling wing length is located on the X chromosome. A recessive mutant allele of this gene makes the wings miniature—hence, its symbol m; the wild-type allele of this gene, m_, makes the wings long. One of the genes controlling eye color is located on an autosome. A recessive mutant allele of this gene makes the eyes brown—hence, its symbol bw; the wildtype allele of this gene, bw_, makes the eyes red. Miniature-winged, red-eyed females from one true-breeding strain were crossed to normal-winged, brown-eyed males from another true-breeding strain. 1. Predict the phenotypes of the F1 flies. 2. If these flies are intercrossed with one another, what phenotypes will appear in the F2, and in what proportions?
- Here are schematic diagrams of mutant Drosophila larvae. The left side of each pair shows a wild-type larva, with gray boxes showing the sections that are missing in the mutant larva. Which type of gene is defective in each larva: a gap gene, a pair-rule gene, or a segment-polarity gene?In Drosophila subobscura, the presence of a recessive gene called grandchildless (gs) causes the offspring of homozygous females, but not those of homozygous males, to be sterile. Can you offer an explanation as to why females and not males are affected by the mutant gene?Suppose a researcher has three different Drosophila strains that have mutations in the bicoid gene called bicoid-A, bicoid-B, and bicoid-C; the wild type is designated bicoid +. To study these mutations, phenotypically normal female flies that are homozygous for the given bicoid mutation were obtained, and their oocytes were analyzed using a Northern blot to determine the size and/or amount of the bicoid mRNA and in situ hybridization to determine the bicoid mRNA location within the oocyte. A wild-type strain was also analyzed as a control. In both cases, the probe was complementary to the bicoid mRNA and the results are shown below. (Anterior is on the left; posterior is on the right.) Northern blot 1 2 - 3 4 In situ hybridization Wild type Lane 1. Wild type (bicoid*) Lane 2. bicoid-A Lane 3. bicoid-B Lane 4. bicoid-C bicoid-B bicoid-A bicoid-C Which mutation is likely to cause the embryo to develop two "anterior" ends? bicoid-B Obicoid-A bicoid-C
- . In Drosophila melanogaster many eye color mutations are known. One such recessive mutation is called brown (bw) and gives brown eyes instead of the wild type dark red eyes. Another recessive mutation is scarlet (st) which gives bright red eyes. The bw st double mutant has white eyes. A brown-eyed male was crossed to a scarlet- eyed female. The F1 progeny were wildtype. When the F1 males were test-crossed to bw/bw st/st females the following progeny phenotypes were produced: 1/4 wildtype, 1/4 brown, 1/4 scarlet, 1/4 white. These results show that the two genes are? Select all that apply a)linked and 25cM apart b)sex linked c)linked d)assorting independently Please answer asap and in short and content should not be palgarised please answerCertain genes determine sex, fertility, and viability in Drosophila, and mutations in these genes affect the two sexes differently. Classify the descriptions below based on their occurrence in XY or XX flies. Some descriptions may be used in both categories. The expressed form of Dsx activates maleness genes and represses femaleness genes. XY XX Null mutations in the dsx gene result in an intersex phenotype. Loss-of-function mutations in the tra gene have no effect on phenotype. Sxl is expressed in early embryogenesis from the establishment promoter. Flies that produce Fru-M in brain cells from a transgene perform a mating dance and specifically court females. Loss-of-function mutations in the fru gene result in flies who court both males and females. Sxl regulates splicing of its own RNA to produce a functional protein. The expressed form of Dsx activates femaleness genes and represses maleness genes. Loss-of-function mutations in the Sxl gene have no effect on phenotype. ResetFlies homozygous for recessive null mutations in thesevenless (sev) or bride-of-sevenless (boss) genes have the same mutant phenotype: Every ommatidium(facet) in their eyes lacks photoreceptor cell 7 (R7).The R7 cells enable flies to detect UV light.a. Given that flies normally move toward light, suggest a screening method that would enable you toidentify mutations in additional genes required forR7 determination.b. Would you be able to recover mutations in everygene required for R7 development with yourmethod? Explain.c. How could you tell whether any of the new mutationsyou found in your screen are alleles of sev or boss?d. Suppose you found one recessive mutant allele ofa gene not previously known to be involved in eyedevelopment. How could you use this allele in anew mutagenesis screen to find additional allelesof this gene? Why might you want additional mutant alleles to study the process?