Two alleles are in linkage disequilibrium with each other:
if an individual is more likely to pass down those two alleles together.
if they are non-randomly associated in a population.
if they are nearby on the same chromosome.
if they are linked.

If they are non-randomly associated in a population

Explanation:

that scientist would be robert hooke

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.

i hope this : )