In a species of fly, smooth wings (W) are dominant to wrinkled wings (w) and red bodies (R) are dominant to yellow bodies (r). A WwRr and wwrr fly mate and produce the following offspring: What is the best explanation for the results? smooth red 778 smooth yellow 162 wrinkled red 158 wrinkled yellow 785 The genes for wing color and wing texture are either far apart on the same chromosome, or on separate chromosomes. The genes for wing co

In a species of fly, smooth wings (W) are dominant to wrinkled wings (w) and red bodies (R) are dominant to yellow bodies (r). A WwRr and wwrr fly mate and produce the following offspring: What is the best explanation for the results? smooth red 778 smooth yellow 162 wrinkled red 158 wrinkled yellow 785 The genes for wing color and wing texture are either far apart on the same chromosome, or on separate chromosomes. The genes for wing co

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Description: In a species of fly, smooth wings (W) are dominant to wrinkled wings (w) and red bodies (R) are dominant to yellow bodies (r). A WwRr and wwrr fly mate and produce the following offspring: What is the best explanation for the results?smooth red 778sm

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 2CT: Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how...

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In DrosophilaI, yellow body (y), crossveinless (cv), and forked bristles (f) are all found in the X chromosome, in that order. Yellow is 14 map units from crossveinless, and crossveinlessis 32 map units from forked. A yellow, forked female is crossed to a crossveinless male. An F1 female is crossed to a yelow, crossveinless, forked male, yielding the F2 generation. In the F2, what is the probability of obtaining progeny that express crossveinless and forked, but not yellow? Assume a coefficient of coincidence of 1. In the F2, what is the probability of obtaining progeny that are completely wild type? In the F2, what is the probability of obtaining progeny that express crossveinless, but not yellow or forked?
In Drosophila,, the curled mutation (cu, chromosome 3, position 50.0) results in wings that curl up, while ebony (e, chromosome 3, position 70.7) results in a dark body. True breeding, wild type females are mated with true breeding males with curled wings and ebony bodies. Considering Drosophila notation, which of the following correctly diagrams the P1 cross? X X ++ e + + + O+ X + X + ■ + X + + + 3+ X X X X + + Y Y cu cu cu + cu cu J e e e e e (D e + cu cu (D
Female flies with white eyes and miniature wings (both X-linkedrecessive traits) were crossed to male flies with red eyes and longwings. On rare occasions, female offspring were produced withwhite eyes. If we assume these females are due to errors in meiosis, what would be the most likely chromosomal composition ofsuch flies? What would be their wing length?
A fruit fly with a gray body and red eyes (genotype BbPp) is mated with a fly having a black and purple eyes (genotype bbpp). Show diagrammatically a genetic cross between the two flies and the possible genotypes and phenotypes of F1. What ratio of offspring would you expect if the body-colour and eye-colour genes are on different chromosome (unlinked)? When mating is actually carried out, most of the offspring look like the parents, but 3% have a gray body and purple eyes, and 3% have a black body and red eyes. Compare and discuss the observation with your answer in part (
In Drosophila melanogaster, red eyes are dominant over white and the variation for this characteristic is on the X chromosome. Vestigial wings (v) are recessive to normal (V) for an autosomal gene. Predict the appearance of offspring of the following crosses: XW/Xw V/v×Xw/Y v/v, Xw/Xw V/v × XW/Y V/v.
PURPLE VESTIGIAL DIHYBRID CROSS In the parental generation, you mate a pure-breeding wild-type female (put/pu+;vg+/vg+) with a pure-breeding purple, vestigial (pu/pu;vg/vg) to produce an F1 generation that is all wild-type (pu*/pu;vg+/vg). Note that the F1 flies are all dihybrid. Next, you mate several F1 dihybrid females (pu*/pu;vg+/vg) with tester males, which are purple, vestigial (pu/pu;vg/vg). The offspring of this dihybrid testcross are: Phenotype Genotype Tester Gamete Dihybrid Gamete Number Wild-type 437 417 77 59 Purple, vestigial Vestigial Purple Copy the table into your notes and derive the dihybrid gametes following the example in the first section. The columns in blue (phenotypes and numbers of offspring) are what you can see and count. The genotypes of the testcross offspring (orange) must be deduced from the phenotypes and knowing that the tester contributed pu vg gametes. Finally, you can deduce the dihybrid gametes (green) by subtracting the tester gamete contribution…
In Drosophila melanogaster, red eyes are dominant over white and the variation for this characteristic is on the X chromosome. Vestigial wings (v) are recessive to normal (V) for an autosomal gene. Predict the appearance of offspring of the following crosses: XW/XwV/v×Xw/Y v/v, Xw/XwV/v×XW/Y V/v.
In Drosophila,, the curled mutation (cu, chromosome 3, position 50.0) results in wings that curl up, while ebony (e, chromosome 3, position 70.7) results in a dark body. True breeding, wild type females are mated with true breeding males with curled wings and ebony bodies. Considering Drosophila notation, which of the following correctly diagrams the F1 cross? X X 3+ cu e + X X e + + + + + cu e + O + ■ 3+ X X X X Y Y + + ■ cu cu cu ' + ■ cu ■ ' + e + e e e e e + cu +
Two different genes are located on the same chromosome in rabbits. A particular female rabbit is heterozygous for alleles of both genes, with alleles arranged as shown in the diagram to the right. Scientists know that the two genes are on the same chromosome, but do not know their exact relative positions, as indicated by the dashed line. Suppose this female mates with a male rabbit in which the same r. chromosome pair looks like this: Which of the following statements best describes the likelihood that this pair of rabbits would have offspring with a chromosome pair that looks like this: * O More likely if the two genes are not very close together on the chromosome E-i-e R- O Not likely, because the R and e alleles are not on the same chromosome in either parent O More likely if the two genes are very close together on the chromosome O Very likely, because the random assortment of chromosomes during cell division to make sperm or eggs allows for the mixing of all alleles
In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn+ and ct+ is crossed to a sn ct male. The F1 flies are interbred. The F2 males are distributed as follows sn ct 36 sn ct+ 13 sn+ ct 12 sn+ ct+ 39 What is the map distance between sn and ct?
In Drosophila, two genes w and s are X-linked and are 25 map units apart. A heterozygous female fly with a genotype w* s*/ws (w* and s* are wild-type alleles) is crossed to a male wild-type fly. What percent of progeny will have only the wild- type alleles of the w and s genes? O 50% 75% O 12.5% 37.5% 25%
Barr bodies are formed to adjust X chromosome dosage in species other than humans, such as Drosophila (fruit flies) and C. elegans (nematodes). True or False ?

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		The genes for wing color and wing texture are either far apart on the same chromosome, or on separate chromosomes.
		The genes for wing color and wing texture are linked to each other on the same chromosome at a distance of 17 MU
		The genes for wing color and wing texture are linked to each other on the same chromosome at a distance of 83 MU
		The genes for wing color and wing texture are so far apart on the same chromosome that an excess of recombinant progeny was observed