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. crosses among heterozygotes give a 12: 3: 1 ratio. what type of gene interaction would account for these results?

A. epistasis

Explanation:

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. Crosses among heterozygotes give a 12:3:1 ratio. Epistasis is the type of gene interaction that would account for these results.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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