Introduction of previously nonexistent genes into a population may be accomplished by
a. nonrandom mating.
b. mutation.
c. sexual recombination.
d. the founder effect.
e. birth.
B
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There are different versions of the gene that codes for fur thickness, one of which codes for
thicker fur and another that codes for thinner fur. In 1995, about 50 percent of the animals had thicker fur, and the other 50 percent had thinner fur. In the spring of 2012, after several years of low snow cover, 70 percent of the population had thicker fur, while only 30 percent had thinner fur. This change in the population is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Low levels of the neurotransmitter dopamine can lessen the ability to focus effectively on tasks. However, high levels of dopamine can result in feelings of motivation. How would you classify dopamine and why?
A) Dopamine is excitatory because it enhances motivation levels. B) Dopamine is inhibitory because it diminishes the ability to focus. C) Dopamine is both inhibitory and excitatory because it can enhance motivation levels but diminish the ability to focus.
Scs elements are examples of
a. histones. b. hypersensitive sites. c. LCRs. d. insulators. e. nonhistones.
4. To choose your primary care physician, the most important point(s) is(are) _____
to make sure your health plan covers it to find one that is close by where you live to feel comfortable with the person all of the above