A color-blind man and a woman with normal vision whose father was color blind have a son. Color blindness, in this

case, is caused by an X-linked recessive gene. If only the male offspring are considered, the probability that their son is
color-blind is ____.
a. 25 percent
b. 50 percent
c. 75 percent
d. 100 percent
e. 0 percent


ANSWER: b

Biology & Microbiology

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In reptiles, the circulatory system of the lungs is nearly completely separate from the circulatory system of the rest of the body

Indicate whether the statement is true or false

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Major trends in the evolution of animals

include

a. cephalization, the development of a definite head region. b. the development of types of symmetry. c. variation in coelomic cavities. d. segmentation. e. all of these

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Pressure in the middle ear is equalized with the external air pressure through the auditory tube

Indicate whether the statement is true or false

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In anaerobic respiration, the final electron acceptor is

a) oxygen. b) ATP. c) an inorganic molecule other than oxygen. d) an organic molecule.

Biology & Microbiology