uld pound 1 prevents protein A from bi y functional e are o not specify wild-typ
ID: 143674 • Letter: U
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uld pound 1 prevents protein A from bi y functional e are o not specify wild-type male? 37. Considering your answers to Problem 36, does the ex41. The garden Thrwer istence of a particular variation of a 9.33:1 atio among the Fa progeny allow you to infer the operation of a specific biochemical i these phenotypes? Inversely. if you kinow a biochemi cal mechanism of gene interaction, can you predict the ratios of the phenotypes you would see among the Sulpiglossis so coones in waay different colors mechanism responsible huce F pants, which are the left of what pheno fertilized to produce pecgey Section 3.3 You picked up two mice (one female and one male) that had escaped from experimental cages in the animal facility. One mouse is yellow in color, and the other is brown agouti. (Agouti hairs have bands of yellow while non-agouti hairs are solid-colored.) You know that this mouse colony has animals with different al- leles at only three coat color genes: the agouti (A) or non-agouti (a) or yellow. (A') alleles of the A gene (A A>a: A is a recessive lethal), the black (B) or brown (b) alleles of the B gene (B> b), and the albino (c) or non-albino (C) alleles of the C gene (C> e, ce is epistatic to all other phenotypes). However, you don' know which alleles of these genes are actually present in each of the animals that you've captured. To deter- mine the genotypes, you breed the two escaped mice to- × yellow a. State a hypothesis explaini lower color in pairted to b. Assign genotypes to the F: progeny for all five c c. In a cross between true breeding lavender pla bronze. If you used v F2 generation, what would you expect? might produce a p from earlier expe alter the phenoty gether. The first litter has only three pups. One is albino, one is brown (non-agouti), and the third is black agouti. 42. In foxgloves, three white with red sp red (LR). Two d strains (WR-I a two-generation and LR strain the a. What alleles of the A, B, and C genes are present in the two mice you caught? b. After raising several litters from these two parents. you have many offspring. How many different coat color phenotypes (in total) do you expect to see ex pressed in the population of offspring? What are the phenotypes and corresponding genotypes? Par ound WR 3.21 and Fig. 3.28b both show traits that are ined by two genes, each of which has two in- tely dominant alleles. But in Fig. 3.21 the gene ion produces nine different phenotypes, whileExplanation / Answer
37) In dihybrid cross, if the two genes assort independently of each other, the phenotypic ratio that can be observed in the F2 progeny is 9:3:3:1. This is in accordance with Mendel's law of independent assortment.
If the phenotypic ratio is modified in the F2 progeny, we can infer that the genes are not assorting independently. Therefore, if we know the biochemical mechanism of gene interaction, we can easily predict the F2 phenotypic ratio.
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