Speciation occurs ____
a. after populations become reproductively isolated
b. when mutations generate observable differences
c. when transitional forms develop between different populations
d. when natural selection pressures reach their maximum
e. randomly as mutations build up in a population
ANSWER: a
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A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. amniocentesis. B. genetic counseling. C. chorionic villi sampling. D. a pedigree analysis.
Assuming one glucose molecule being metabolized, what is the net yield of ATP in the cell under anaerobic
conditions? a. 1 b. 2 c. 32 d. 34 e. 36
The dominant allele of a gene is the most frequently found allele in a population
Indicate whether the statement is true or false
Suppose an individual is born with both an X and a Y chromosome, but the Y chromosome has a mutation that eliminates the function of the SRY gene. How would this person appear phenotypically?
a. hermaphrodite b. male c. male, but with some female features d. female