When certain medium height hybrid plants were crossed, they produced offspring that were dwarf,
medium, and tall in a ratio of 1 : 2 : 1. This is an example of:
a. variegation.
b. hybrid vigor.
c. incomplete dominance.
d. epistasis.
e. a polygenic trait.
C
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All of Earth that is inhabited by life is called the
A) atmosphere. B) ecosystem. C) biosphere. D) biome.
Which of the following tends to be more complex in a parasitic helminth than in free-living helminths?
A) digestive system B) nervous system C) reproductive system D) digestive and nervous systems E) digestive, reproductive, and nervous systems
Which statement is correct, according to the figure above?
a. Descendant populations of the mustard plant growing after the severe 2000–2004 drought flowered much earlier in the season than those from predrought populations. b. Descendant populations of the mustard plant growing after the severe 2000–2004 drought flowered much later in the season than those from predrought populations. c. Hybrids flowered much later in the season than those from predrought populations. d. None of the above. e. B and C.
One consequence of genetic drift is:
a. increasing heterozygosity in the population. b. the maintenance of multiple alleles across long periods of time. c. populations diverge in terms of their allele frequencies. d. populations maintain the same set of alleles through time. e. All of the above.