Two populations experience equally severe bottlenecks, reducing each to one-tenth of its original size. One population is in the bottleneck for one generation, and the other is in the bottleneck for five generations
You assess the heterozygosity of both populations after they have been restored to their prebottleneck size. What do you expect to find, and why?
The population that was bottlenecked for five generations is likely to have lost much more genetic variation than the one bottlenecked for only one generation. This is because each generation in a bottleneck state is equivalent to a separate bout of genetic drift, losing variants by chance each time.
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Which of the following types of selection favors the survival of individuals with the intermediate phenotype?
A. Disruptive selection B. Stabilizing selection C. Directional selection
Mammals and birds are descendents of reptiles, but are not included within the taxon Reptilia. As a taxon Reptilia is
A. polyphyletic. B. polygenetic. C. paraphyletic. D. a supergroup. E. a kingdom.
Assume that a bacterial cell produces a lac repressor that is able to bind to the operator sequence of the
lac operon but cannot bind allolactose. Explain the effect of transcription of the lac operon when lactose is not present, and then when it is present.
What will be an ideal response?Two EPSPs combine to drive a cell to threshold potential. This is an example of ____
a. neuromodulation b. intersignaling c. neurotransmitter release d. synaptic inhibition e. summation