Which of the following is true about cell-free fetal DNA?
A. it refers to small pieces of maternal DNA detected after 10 weeks of gestation
B. it can be detected in the blood only after 25-27 weeks of gestation
C. it refers to small fragments of fetal DNA that cannot be distinguished from the mother's DNA in the blood
D. it originates from the placenta
D. it originates from the placenta
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Which of the following is typical of one-male polygynous groups?
a. One male mates with one female only. b. One male monopolizes multiple females. c. One male lives with one female at a time. d. One male lives with one female yet mates with many.
In Mendel's experiments, the ratio of tall to short plants in the F2 generation was
a. 15 to 1. b. 3 to 1. c. 1 to 1. d. 4 to 1. e. 5 to 1.
Structural genes are involved in such features as:
A) energetic and biosynthetic activities of the body B) eye color and susceptibility to certain diseases C) lifespan and body weight D) skin color and metabolism E) susceptibility to certain diseases and metabolism
When were Labov's (1966) participants most likely to use the most standard language forms?
A when reading stories B when speaking carefully C when reading word lists D when having casual conversation E when reading minimal pairs