Which of the following is a true statement concerning genetic variation?
a. it is created by the direct action of natural selection
b. it arises in response to changes in the environment
c. it must be present in a population before natural selection can act upon the population
d. it tends to be reduced by the processes involved when diploid organisms produce gametes
e. a population that has a higher average heterozygosity has less genetic variation than on with a lower average heterozygosity
Ans: c. it must be present in a population before natural selection can act upon the population
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In situations where signaling pathway components need to be "fixed" in a particular position within the cell (e.g., in the yeast mating pathway), they are associated with ________.
Fill in the blank(s) with the appropriate word(s).
All of the varied sensations we experience are due to which three categories of sensory receptors?
A. visioceptor, audioceptor, olfactoceptor B. exteroceptor, interoceptor, proprioceptor C. mechanoreceptor, chemoreceptor, electromagnetic receptor D. mechanoreceptor, olfactory receptor, photoreceptor E. mechanoreceptor, chemoreceptor, nociceptor
Which of the following statements is inconsistent with the results from investigations of genetic vs. environmental influences on IQ shown on the previous slide?
1.Children raised apart from a biological parent generally have IQs as similar to the parent as children who were raised by that parent.
2.Differences in IQ between siblings reared together are attributed both to variations in environment and to the fact that only half their genes are shared.
3.Nonbiological sibling pairs reared together show more concordance in IQ scores than would be expected based on degree of relatedness.
4.Differences in IQ between monozygotic twins reared separately can be attributed to environmental influences.
Why are ehrlichiosis and anaplasmosis of concern?
A) Both produce major signs that can be permanent. B) Treatment is long and difficult for both. C) Both are fatal. D) Incidence of both is increasing. E) Areas of infection are spreading to other countries.