What does the term equilibrium refer to in population genetics?
a. a state in which the frequencies of the alleles for a gene remain
constant
b. a state in which the total number of genes in a population remains
variable
c. a state in which the proportions of all alleles in a population vary
constantly
d. a state in which the number of traits an organism has stays the
same

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

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