White fruit color in summer squash is influenced by
a dominant allele W, whereas colored fruit must be
ww. In the presence of ww, a dominant gene G
results in yellow fruit, and if the individual had both
recessive genes in the homozygous condition, it
would be green. Give the F2 phenotypic ratios
resulting from a cross of a pure-breeding white of
genotype WW GG with a green. What will be an ideal response?
Answer: 12/16 W__ __ __ white, 3/16 ww G __ yellow, 1/16 ww
gg green
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In the case of complete dominance, if a plant has a ____ genotype for a particular trait, its phenotype will have the ____
trait.
a. heterozygous; recessive b. homozygous dominant; recessive c. homozygous recessive; dominant
d. heterozygous; dominant e. heterozygous; recessive
During which of the following time periods does a CAM plant use rubisco?
a. daylight only b. in darkness only c. noon to midnight d. midnight to noon e. all 24 hours of a standard calendar day
A hybrid zone is properly defined as
a. an area adjacent to tow closely related species b. an area where mating occurs between members of two closely related species, producing viable offspring c. a zone that features a gradual change in species compostion between two neighboring ecosystems that border each other d. a zone that includes the intermediate portion of a cline e. an area where members of two closely related species intermingle, but experience no gene flow.
_________________ is the effect of chance on a populations allele frequencies
A. Natural selection B. Mutation C. Genetic drift D. Gene flow