15. DNA is referred to as the

Chromosome 15 contains a cluster of imprinted genes in the q11-q13 region, many of which are involved in brain development and function and normally undergo exclusively maternal expression.

Explanation:

Deoxyribonucleic acid

Explanation:

This molecule contains the genetic code of organisms

cancer   is   essentially   uncontrolled   mitosis   of specialized cells

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.