Zygote is the diploid cell that results from the fertilization between an egg and a sperm. Etymology. Came from the Greek word âgametesâ meaning âhusbandâ and âgameteâ meaning âwife.â. Came from the Greek word âzygotosâ meaning âjoined or yoked or to yoke.
This is not causation, but facilitation after the fact. Stating that estrogen causes breast cancer is like saying fertilizer causes weeds. In a garden even weeds need some soil nutrients, and if these are completely removed, the weeds can't grow...but neither can the desired plants.
In general, estradiol causes cells to proliferate and progesterone causes cells to differentiate and grow up. Estradiol causes the femaleness in women. It causes the breasts to grow and the hips to round out. However, too much estradiol can cause an increased incidence of breast cancer. Women who have menarche early and have menopause later are at a greater risk of breast cancer.