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.
1 Women who have had breast cancer or have a family history of breast or ovarian cancer have an increased risk of ovarian cancer.  Women who take estrogen replacement only (not with progesterone) for 5 years or more may have a high risk of ovarian cancer. Birth control pills, however, decrease the risk of ovarian cancer.