What is the definition of epistasis? A. When the allele of one gene masks the phenotype of another gene B. When the allele of one gene changes the phenotype of another gene C. When the allele of one gene changes the genotype of another gene D. When the allele of one gene masks the genotype of another gene

then that particular organisms become extinct.

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."