A male expresses
A. only the homozygous recessive alleles on his X chromosome.
B. none of the alleles on his X chromosome.
C. only the dominant alleles on his X chromosome.
D. both the dominant and recessive alleles on his X chromosome.
E. None of the answer choices is correct.
D. both the dominant and recessive alleles on his X chromosome.
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What will be an ideal response?
Rod cells differ from cone cells in that
a. rod cells respond to changes in light intensity, and cone cells detect very dim light. b. rod cells contain pigments which enable the perception of color, and cone cells respond to changes in light intensity. c. rod cells respond to changes in light intensity, and cone cells contain pigments which allow for the perception of color. d. rod cells are responsible for acute daytime vision, and cone cells detect very dim light. e. they are none of these.
In which animal is a crosscurrent flow system used for air exchange?
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