Response of a quantitative character to selection will be greatest when heritability is and selection is
A. 0.40; 4
B. 0.75; 4
C. 0.60; 4
D. 0.75; 2.5
E. 0.40; 2.5
Ans: B. 0.75; 4
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Aquaporins are
A) water transport proteins. B) molecules that prevent water from crossing a membrane. C) enzymes involved in the generation of water within cells. D) cations bound to water molecules.
The photoreceptor that absorbs blue light and triggers a phototropic response is:
a. phototropin. b. phytochrome. c. jasmonate. d. systemin. e. zeatin.
Cells from advanced malignant tumors often have very abnormal chromosomes and an abnormal number of chromosomes. What might explain the association between malignant tumors and chromosomal abnormalities?
A) Cancer cells are no longer density-dependent. B) Cancer cells are no longer anchorage-dependent. C) Cell cycle checkpoints are not in place to stop cells with chromosome abnormalities. D) Transformation introduces new chromosomes into cells.
Consider a population of size Ne in which a new mutation that confers a fitness ad-vantage of 1+s. This new allele will be more likely to go to fixation due to selection if:
a. Ne is large. b. Ne is small. c. s is small. d. s is large. e. A and D.