Biology: The Dynamics of Life, North Carolina Edition

Section 2: When Heredity Follows Different Rules

When Heredity Follows Different Rules

1
__________ cause the phenotypes of both homozygotes to be produced in heterozygous individuals.
A)Environmental influences
B)Codominant alleles
C)mutations
D)Incomplete dominances
2
Which of these statements is true?
A)Premature balding is a dominant gene in human males and females.
B)Traits for human skin color are governed by only one gene.
C)The color of a peacock's feathers is always the same as the color of a peahen's feathers.
D)Temperature plays a role in the color of the fur of the arctic fox.
3
Traits that are controlled by genes found on the sex chromosomes are __________.
A)heterozygous
B)sex-linked traits
C)polygenic inheritance
D)autosomes
4
Which of these statements is NOT true?
A)If you are a female, your 23rd pair of chromosomes are XX.
B)Homologous autosomes look alike.
C)Human males produce two kinds of gametes, called X and Y.
D)The 23rd pair of chromosomes are exactly the same in human males and females.
5
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According to the Punnett square, what are the chances that a human offspring will be male or female?
A)25%
B)50%
C)75%
D)100%
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