Many geneticists study the genetic material of organisms such as mice, fruit flies, and yeast. they are able to apply what they learn from these organisms to humans because virtually all different types of organisms:

Study on Genetic material of model organisms like mice, fruit fly and yeast applying to human beings for various benefits or applications in an enormous way is the biggest achievement of genetic engineering and biotechnology principles.

The reason behind this application is virtually all different types of organisms have same genetic code.

"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."