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Exam 6: Matters of Sex

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Question 31

Multiple Choice

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A gene on the Y chromosome that determines maleness is

A) ABO.
B) XIST.
C) SRY.
D) E.BOY.

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Question 32

Multiple Choice

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In genomic imprinting,the expression of a genetic disorder depends on

A) the age of the mother when she became pregnant.
B) whether the trait is X-linked or autosomal.
C) which parent transmits the disease-causing allele.
D) the number of pseudoautosomal genes transmitteD.

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Question 33

Multiple Choice

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Plumage in chickens is of two varieties,a "hen" pattern and a "cock" pattern.They differ because the trait is sex-limited;males have different feather arrangements than females.The autosomal gene H controls the trait in this manner: $\begin{array} { l l } \underline {\text { Genotvpe } }& \underline {\text { Phenotype }} \\ H H & \text { hen pattern in both sexes } \\H h & \text { hen pattern in both sexes } \\h h & \text { hen pattern in females and cock pattern in males }\end{array}$ Henrietta is one of a flock of hens who has chicks with Boris,the lone rooster.He has tantalizingly beautiful plumage in the cock pattern.If Henrietta is genotype Hh,the probability that a male chick will have his father's gorgeous plumage is

Sean has congenital generalized hypertrichosis,an X-linked dominant condition that produces dense hair on the face and upper body.He can pass this trait

Sixteen-year-old Rhapsody has just learned that her younger brother Clyde is colorblind.Although she knows she has color vision because her cat,Juice,is clearly orange,and she reads that nearly all people with colorblindness are boys,she is concerned about her own sons one day.If she is a carrier for colorblindness,then the risk that a son of hers is colorblind is

Human males and females are genetically equivalent because

Homosexuality

Human females are the _____ sex.

Number of eggs laid per week and milk yield are traits that are

Marbles is a calico cat with a Manx tail.She wants to have kittens with a male calico,but can't find one.Male calicos are rare;the only ones have the sex chromosome constitution XXY.Male calicos are therefore rare because