Which of the following best defines a mutation?
a. by-product of natural selection
b. permanent change in a DNA sequence
c. harmful change in a DNA sequence
d. mistake created by faulty mismatch repair
Ans: b. permanent change in a DNA sequence
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These two species of velvet walking worms are an example of:
1.Allopatric speciation
2.Sympatric speciation
3.parapatric speciation
4.Hardy-Weinberg equilibrium
A population has a size of 10,000 individuals, and only 5% of the males successfully mate in any generation. Its response to drift would depend on:
a. the effective population size. b. the population size. c. the strength of drift. d. the strength of selection. e. the inbreeding coefficient.
Sediments that are formed from seawater as a result of a variety of chemical processes are called:
a. cosmogenous. b. hydrogenous. c. organic.. d. biogenous. e. terrigenous.
What happens at time “C” of the action potential?
a. sodium-potassium pumps are active b. potassium gates close and sodium gates open c. sodium gates close and potassium gates open d. positive feedback begins e. both potassium gates and sodium gates close