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

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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