Recombination frequency is ____
a. high if two genes are linked
b. a physical measurement of the distance between two genes on a chromosome
c. low if crossovers are common between two genes
d. measured in centigrams
e. used to create linkage maps
ANSWER: e
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The eggs of the A. lumbricoides worm are ingested and hatched in the duodenum, penetrate the intestinal wall, and migrate to the hepatic portal circulation. Its geographic distribution and in-fection rate are associated with:
a. institutional crowding. b. poor sanitation. c. day care centers. d. moist warm soil.
Two methods of reproduction are common for bacteriophages. Which statement best describes the relationship between the two methods?
a. Viral DNA reproduced via the lysogenic pathway eventually enters the lytic pathway. b. Viral DNA reproduced via the lytic pathway eventually enters the lysogenic pathway. c. Viral DNA in the lysogenic pathway immediately directs the host to reproduce the new viral particles. d. The lytic and lysogenic pathways cannot interact in bacteriophage reproduction. e. The lytic pathway is dependent upon the lysogenic pathway for infection.
The plant hormone that promotes cell division
is
a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene
Assuming that the probability of having a female child is 50% and the probability of having a male child is also 50%, what is the probability that a couple's first-born child will be female and that their second-born child will be male?
A) 20% B) 25% C) 50% D) 75%