Consider a population of crickets in which the A and a alleles at a single locus control the shape of the male and female reproductive organs
Males that are AA can only mate with females that are aa, and vice versa. Heterozygous individuals can mate with either homozygous group. After many generations of selection, the two alleles will reach a ______ equilib-rium due to _______ frequency dependent selection.
a. stable, negative
b. balanced, negative
c. unstable, positive
d. stable, directional
e. unstable, negative
A
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Which of the following is NOT correct regarding DNA and RNA synthesis?
A) The overall direction of chain growth is from the 5' to 3' end. B) Both processes require an RNA primer to begin. C) The template strand is antiparallel to the newly synthesized strand. D) DNA is the template for both DNA and RNA synthesis.
A karyotype reveals:
a) the shape of the spindle. b) 23 pairs of chromosomes. c) the number, shapes, and sizes of chromosomes in an individual cell. d) the sex chromosomes but not the non-sex chromosomes. e) the non-sex chromosomes but not the sex chromosomes.
Contractile vacuoles
A) are generally found in protists that inhabit salt water. B) help in the excretion of excess salt. C) prevent cells from bursting as a result of the influx of excess water. D) allow organisms to avoid dehydration by absorbing water from the environment.
Which of the following statements is the most accurate in regards to mice pups who receive less maternal nurturing?
A) As adults their brains are heavily mutated. B) As adults they have increased promoter methylation. C) As adults they have increased ability to adapt to stress. D) As adults they are more likely to nurture their offspring. E) As adults they have high levels of glucocorticoid receptor expression.