Ch-15-Test-Questions no diagram

Cinnabar eyes is a sexlinked recessive characteristic

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14) Cinnabar eyes is a sex‐linked recessive characteristic in fruit flies. If a female having cinnabar eyes is crossed with a wild‐type male, what percentage of the F1 males will have cinnabar eyes? A) 0% B) 25% C) 50% D) 75% E) 100% Answer: E Topic: Concept 15.2 Skill: Application/Analysis 15) Calico cats are female because 16) In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
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Refer to the following information to answer the questions below. A man who is an achondroplastic dwarf with normal vision marries a color‐blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red‐green color blindness is X‐linked recessive. 17) How many of their daughters might be expected to be color‐blind dwarfs? 18) What proportion of their sons would be color‐blind and of normal height? A) All B) None C) Half D) One out of four E) Three out of four Answer: C Topic: Concept 15.2 Skill: Application/Analysis 19) They have a daughter who is a dwarf with normal color vision. What is the probability that she is heterozygous for both genes? 20) A Barr body is normally found in the nucleus of which kind of human cell?
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