6. A testcross is used to investigate two linked loci. There are four phenotypes among the progeny. The two nonrecombinant phenotypes each occurs at a frequency of 46%. The other two phenotypes are recombinant. How many map units apart are the two loci?
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- 1. The allele G for yellow stigma is completely dominant to green (g). Supposingtwo strains of autotetraploid plants are available and their genotypes are as follows:GGgg – in this plant the gene is close to the centromereGggg – in this plant the gene is far from the centromere If these two plants are crossed:a) provide the gametes that can be obtained from the two plants;b) provide the genotypic and phenotypic ratios of the offspring. 2. Consider the illustration below. Diagram the configuration you would observe at Anaphase I if crossing-over happens within the inversion. (IMAGE ATTACHED)1.What is the genotype of the F1 generation of the corn monohybrid cross described above? 2.What is the phenotype of the F1 generation of the corn monohybrid cross described above? 3.What are the possible maternal and paternal genotypes of the F1 gametes of the corn monohybrid cross described above?2. The homozygous mutant a, an allele of the albinism gene in the mouse, has a white coat and dark eyes. The homozygous mutant p has pink eyes. Mice of genotype a+/+p are testcrossed with mice homozygous for the two mutations. The progeny obtained are shown below. Calculate the recombination frequency and map distance between the two genes. Phenotype of Progeny White coat, dark eyes White coat, pink eyes Dark coat, white eyes Dark coat, pink eyes Number 240 31 34 474
- 1.What are the possible genotypes of the parent gametes of the corn dihybrid cross described above? 2.What is the genotype of the F1 generation of the corn dihybrid cross described above? 3.What is the phenotype of the F1 generation of the corn dihybrid cross described above? 4.What are the possible maternal and paternal genotypes of the F1 gametes of the corn dihybrid cross described above?Why should the relative distance between two loci influencethe amount of recombination and crossing over observedbetween them?1. In a cross between mice the genotypes AB/ab x ab/ab, what is the recombination frequency if the progeny numbers are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab? The alleles are shown for each chromosome, separated by a slash (/). . 2. A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb 40 Aa bb 40 aa Bb 10 aa bb Were the parental alleles in the coupling or repulsion configuration? Briefly explain. 3. Briefly describe how twin studies can reveal whether or not the appearance of a trait is strongly influenced by genetics.
- 31 1. In guinea pig, fur color is determined by one gene, and fur length by another independently segregating gene. The black fur allele (B) is dominant to brown fur allele (b) and the short allele (S) is dominant to long fur allele (s). From progeny listed in the following table, provide the probable genotype for the parents of each cross. Phenotype of Progeny Black short black long brown short Bio3110 Genetics Additional problems (Chapter 2): Parents Black short X Black short Black short X Brown long Black long X Black long 90 17 0 32 16 35 29 14 0 brown long 8 15 2. A mouse with the genotype BbccEeFf is mated with another mouse with BBCcEEFF genotype. What is the probability of obtaining the following genotype in the progeny? a. BBCcEeFF b. BbccEEFf C. BbccEeFF 12 3. Determine the type of gametes that are formed from the following individuals with the given genotype? A. AaBbCc B. AABBCc C. AABbCcWhich recombination frequency corresponds to independent assortment and the absence of linkage? 0 0.25 0.50 0.75Figure 13.4 Which of the following statements is true? Recombination of the body color and red/ cinnabar eye alleles will occur more frequently than recombination of the alleles for wing length and aristae length. Recombination of the body color and aristae length alleles will occur more frequently than recombination of red/brown eye alleles and the aristae length alleles. Recombination of the gray/black body color and long/short aristae alleles will not occur. Recombination of the red/brown eye and long/short aristae alleles will occur more frequently than recombination of the alleles for wing length and body color.
- Which recombination frequency corresponds to perfect linkage and violates the law of independent assortment? 0 0.25 0.50 0.751. A mechanism for equalizing the expression of X-linked genes in males and females of a species. [ Choose ] Conjugation Reciprocal Crosses Transduction Binary Replication Haplotype Interference Transformation Gain of Function Mutation Allelic Series Blending Theory Dosage Compensation Rolling Circle Replication Pleiotropy Coefficient of Coincidence Reciprocal Cross Loss of Function Mutation Synaptonemal Complex Allelic Phase Allele Chiasma Law of Independent Assortment 2. A group of alleles of a gene that show a hierarchy of dominance relationship among them. [ Choose ] Conjugation Reciprocal Crosses Transduction Binary Replication…2. A series of 2-point crosses were carried out among 7 loci (a, b, c, d, e, f, and g), producing the following recombination frequencies. Map the 7 loci, showing their linkage groups, the order of the loci in each linkage group, and distances between the loci of each group. Loci % Recombination Loci % Recombination - b 50 c-d 50 а — а — с 50 С —е 26 а —d 12 c-f 50 а — е 50 С — 50 а -f 8. d - e 50 50 d-f d-g е -f 4 50 a - g b - c b - d b - e b-f b -g 10 8. 50 50 18 e -g 50 50 f - g 50 50