In humans, the gene for Huntington's disease contains a triplet sequence repeat, which is expanded in the disease allele, relative to the normal allele. This type of change in DNA is called a .

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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answer///multiple alleles;