What happens to population size (N) if there is no constraint on growth?
a. The population will quickly level out and maintain an equilibrium.
b. The population will grow continuously at the same rate.
c. The population will grow continuously at an ever-increasing rate.
d. The population will decline.
c
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Which mechanism(s) increase(s) genetic diversity?
a. crossing-over between chromosomes during meiosis only b. independent assortment of chromosomes during meiosis only c. random DNA mutations only d. crossing-over between chromosomes and independent assortment of chromosomes during meiosis only e. crossing-over between chromosomes, independent assortment of chromosomes during meiosis, and random DNA mutations
XY individuals with total androgen insensitivity syndrome ____
a. do not secrete testosterone b. do not have testes c. have mutated testosterone receptors in their cells d. secrete more estrogen than testosterone e. have normal male genitalia
In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black (BB), when crossed
with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a true-breeding black with a single comb and a true-breeding splashed-white with a rose comb. What will be an ideal response?
Which of the following are examples of systemic infections, or those that spread to several sites and tissues, usually in the bloodstream?
a. AIDS b. A wart c. An infected cut d. A boil e. Typhoid fever