Whenever diploid populations are in Hardy-Weinberg equilibrium at a particular locus, _____
A) the allele's frequency should not change from one generation to the next
B) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency
C) two alleles are present in equal proportions
D) individuals within the population are evolving
A
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When a farmer grows cotton containing the gene for Bt toxin, insects that are resistant (rr) survive and reproduce. This is an example of Select one:
a. natural selection. b. dominance. c. independent assortment. d. recombination. e. genetic drift.
The characteristic that enables efficient gas exchange in capillaries is:
a. the very short total length of the capillaries. b. their proximity to the heart. c. thick walls of connective and muscle tissue. d. walls that are only one cell thick. e. vasoconstriction.
Organisms that live in habitats with high levels of competition are more likely to produce defensive chemicals than those that live with little competition
Indicate whether the statement is true or false
The interaction of two or more polypeptide chains in a hemoglobin molecule is its ____ structure.
A. primary B. secondary C. tertiary D. quaternary E. combined