The frequency of phenotypes of traits controlled by__ follows a bell-shaped curve a) multiple alleles
b) polygenic inheritance
c) autosomal recessive inheritance
d) co-dominance

The frequency of phenotypes of traits controlled by__ follows a bell-shaped curve - b) polygenic inheritance

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B

Explanation:

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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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