Unlike mammals, birds lack XY chromosomes. Instead, birds have a ZW system, where males have two Z chromosomes and females have ZW. Chickens can have red or silver-white plumage. Examine the following data set and answer the following questions. Each cross represents a different set of birds: Cross P 3 14 Parents Red roosters Red hens Red rooster x 10 red hen Silver rooster 10 x red hen Red rooster x 5 silver hen Red rooster x 10 silver hen 15 16 11 Offspring Silver roosters Silver hens 15 O 16 11 5 10 A. On which chromosome (Z or W) is the gene for this trait located? What is the mode of inheritance of this trait? Explain your answer. B. What are the genotypes of parents in each cross?
Unlike mammals, birds lack XY chromosomes. Instead, birds have a ZW system, where males have two Z chromosomes and females have ZW. Chickens can have red or silver-white plumage. Examine the following data set and answer the following questions. Each cross represents a different set of birds: Cross P 3 14 Parents Red roosters Red hens Red rooster x 10 red hen Silver rooster 10 x red hen Red rooster x 5 silver hen Red rooster x 10 silver hen 15 16 11 Offspring Silver roosters Silver hens 15 O 16 11 5 10 A. On which chromosome (Z or W) is the gene for this trait located? What is the mode of inheritance of this trait? Explain your answer. B. What are the genotypes of parents in each cross?
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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Transcribed Image Text:Unlike mammals, birds lack XY chromosomes. Instead, birds have a ZW system, where males
I have two Z chromosomes and females have ZW.
Chickens can have red or silver-white plumage.
Examine the following data set and answer the following questions. Each cross represents a
different set of birds:
Cross
13
14
Parents
Red roosters Red hens
Red rooster x 10
red hen
Silver rooster 10
x red hen
Red rooster x 5
silver hen
Red rooster x 10
silver hen
15
16
11
Offspring
Silver roosters Silver hens
10
15
10
O
16
11
5
O
A. On which chromosome (Z or W) is the gene for this trait located? What is the mode of
inheritance of this trait? Explain your answer.
B. What are the genotypes of parents in each cross?
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