If all offspring of a cross have the genotype Aa, the parents of the crosses would most likely be
a. AA ? aa.
b. Aa ? Aa.
c. Aa ? aa.
d. AA ? Aa.
e. none of these.
A
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Natural selection favoring the heterozygote
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Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Assume that two fully heterozygous plants are crossed. Give the phenotypes (with
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