4.In humans,the allele for a widow's peak (W) is dominant and the allele for a straight hairline (w) is recessive.This trait shows complete dominance.Which of the following represents the possible phenotypes in the offspring of two parents,both with

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4.In humans,the allele for a widow's peak (W) is dominant and the allele for a straight hairline (w) is recessive.This trait shows complete dominance.Which of the following represents the possible phenotypes in the offspring of two parents,both with
4.In humans,the allele for a widow's peak (W) is dominant and the allele for a straight hairline (w) is recessive.This trait shows complete dominance.Which of the following represents the possible phenotypes in the offspring of two parents,both with a straight hairline?
A All offspring will have a widow's peak.
B Each offspring will show both phenotypes.
C Most of the offspring will have a straight hairline,but it is possible for an offspring to have a widow's peak.
D All offspring will have a straight hairline.
5.Testosterone is responsible for the development of the male reproductive system,and it is produced by the testes.The development of the testes depends on the presence of a Y chromosome.What might occur if the Y chromosome is present,but the testes are unable to produce testosterone?
A normal female development
B The testes would be present,but further male development would be arrested.
C normal male development
D The testes and ovaries would be present.
6.An infant born with the genotype XYY will __________.
A.be phenotypically male,often tall,and usually of normal intelligence
B.be phenotypically female and fertile
C.be phenotypically male,short,and mildly retarded
D.show partial male and partial female development

6.A 解析：基因型为XYY的新生婴儿，长大之后表现型为男性，一般较高，且通常情况下具有正常的智力。

4.D
5.C
6.D

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