Suppose the tail length of two populations of lizards is controlled by one gene. To determine the mode of inheritance, a true-breeding short-tailed female is crossed with a true-breeding long-tailed male. Then, siblings from the F1 are crossed and the number of short- and long-tailed animals are counted to determine the phenotype ratio. 1. What phenotypic ratio do you expect in the F2 generation if tail length is controlled by an autosomal gene, and long tails are dominant to short tails? 1 long: 1 short males 1 long: 1 short, females all short O 3 long: 1 short 1 long: 3 short 2. What phenotypic ratio do you expect in the F2 generation if tail length is controlled by a sex- linked gene, and long tails are dominant to short tails? Assume a chromosomal sex determination system as in mammals, with XX females and XY males. O 1 long: 3 short O males 1 long: 1 short, females all short O 1 long: 1 short 3 long: 1 short
Suppose the tail length of two populations of lizards is controlled by one gene. To determine the mode of inheritance, a true-breeding short-tailed female is crossed with a true-breeding long-tailed male. Then, siblings from the F1 are crossed and the number of short- and long-tailed animals are counted to determine the phenotype ratio. 1. What phenotypic ratio do you expect in the F2 generation if tail length is controlled by an autosomal gene, and long tails are dominant to short tails? 1 long: 1 short males 1 long: 1 short, females all short O 3 long: 1 short 1 long: 3 short 2. What phenotypic ratio do you expect in the F2 generation if tail length is controlled by a sex- linked gene, and long tails are dominant to short tails? Assume a chromosomal sex determination system as in mammals, with XX females and XY males. O 1 long: 3 short O males 1 long: 1 short, females all short O 1 long: 1 short 3 long: 1 short
Chapter13: Patterns In Inherited Traits
Section: Chapter Questions
Problem 6GP: In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele...
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