In your studies of the Glisczcynski sparrow you discovered three recessive mutations that affect the birds: b produces a pointed beak instead of blunt, t causes turquoise-colored feathers instead of black, and l causes abnormally long tail feathers. You cross triply heterozygous females with homozygous recessive males and find the following results:
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6. In your studies of the rare squirrel S. saberii in Bloomington you noticed several interesting phenotypes. Your studies reveal three recessive mutations that affect the squirrels' tails. b produces blue instead of brown; f causes extremely fuzzy tails instead of normal, and t causes large teeth instead of normal teeth. You cross a triply heterozygous female with a homozygous recessive male and find the following results: 323 blue tail color, extremely fuzzy tail and normal teeth 10 blue tail color, normal fuzzy tail and larger sized teeth 69 blue tail color, normal fuzzy tail and normal teeth 87 blue tail color, extremely fuzzy tail and larger sized teeth 73 brown tail color, extremely fuzzy tail and larger sized teeth 13 brown tail color, extremely fuzzy tail and normal teeth 342 brown tail color, normal fuzzy tail, and larger sized teeth 83 all wild type A. Are the genes linked? Briefly explain why you think they are or are not. B. What is the genotype of each of the original parents (i.e. those that were crossed to produce the offspring listed above)? C. What is the distance between the genes: b and f: b and t: f and t: 7. You suspect that two genes, cb and bx, are linked. A test cross of cb bx/ + + produces the results shown below. cb bx/cb bx 312 + + /cb bx 297 cb +/cb bx 272 + bx/cb bx 281 Are you correct in supposing the two genes are linked? What is the probability that the two genes are unlinked and the results shown are the result of chance? Have you written the genotypes correctly?
Sri K.
In a species of bird, one gene controls feather color, with the blue allele (B) dominant over white (b), and another controls tail length, with long (L) dominant over short (l). You have two lines of birds, one that is true-breeding for blue, long-tailed individuals, and the other for white, short-tailed individuals. Part 1: If you crossbreed individuals of these two true-breeding lines, what are the expected genotype frequencies? What phenotype(s) will these genotypes exhibit? Use a Punnett's Square to help illustrate your answer and explain. Part 2: If you now take one of the hybrid individuals and breed it to a true-breeding blue, short-tailed individual, what are the expected genotype frequencies? What phenotype(s) will these genotypes exhibit? Use a Punnett's Square to help illustrate your answer and explain parts 1 and 2, please.
Katlin K.
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