Changes in chromosome number are usually the result of
A. genetic displacement.
B. trisomy.
C. crossing over.
D. nondisjunction.
E. disjunction.
Answer: D
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Why do flatworms move away from light sources?
A. to avoid skin cancer B. to avoid the mutagenic effects of direct sunlight C. to hide from predators D. their prey are always found in dark environments
Darwin calculated that if reproduction was not limited, a single pair of elephants could leave ____
descendants after 750 years.
a. 750 b. 15,000 c. 150,000 d. 19 million e. 190 million
Segmentation is important in annelids as an aid in:
A. respiration. B. reproduction. C. movement. D. sensation. E. eating
What process resulted in a dramatic increase in milk production in modern dairy cows?
A) the insertion of beta carotene in the cow genome B) the use of recombinant bovine growth hormone C) frameshift mutations in the DNA of the cows D) the use of gene guns to insert new genes into the cow mammary tissues