Two species that sometimes mate and produce vigorous but sterile offspring are affected by
A) gametic isolation.
B) reduced hybrid fertility.
C) reduced hybrid viability.
D) hybrid breakdown.
Answer: B
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Organic molecules with identical molecular formulas and mirror-image structures are referred to as
A. polymers. B. complements. C. enantiomers. D. isotopes. E. double helices.
Background extinction is a measure of
a. the rate of species turnover at the end of geological eras. b. the number of species that suffer extinction at the beginning of geological eras. c. the steady rate of species turnover within a lineage throughout most of their evolutionary history. d. the lowest rate of species turnover within a lineage observed within a geological era. e. the animals that appear in the dense forest.
A woman and her spouse both show the normal phenotype for pigmentation, but both had one parent who was an albino. Albinism is an autosomal recessive trait. What is the probability that their first child will be an albino?
A) 0 B) 1/4 C) 1/2 D) 3/4 E) 1
Cigarette smoke can affect the white blood cells that reside in our lungs, whose function is to
A) prevent emphysema. B) engulf foreign particles. C) enhance oxygen and carbon dioxide exchange. D) maintain appropriate pH and moisture levels within the lungs.