PCB 3063 Lecture Notes - Lecture 3: Phenotype, Product Rule, Dihybrid Cross
Document Summary
The outcome of meiosis is four haploid cells. In a multicellular organism, any cell which undergoes meiosis generates four gamete cells but only two different kinds of gametes (sperm and egg) Thus the number of gametes we can produce is 2^23. The spermatogonia can have mitosis to maintain their population or undergo meiosis to become primary spermatocytes and then secondary spermatocytes. During maturation only few mitochondria is retained and the spermatids mature into sperm. Germ cells are established during 7th month of gestation and enter prophase one at the same time to become primary oocytes. Then there is a meiotic arrest which is released at the onset of puberty. Unequal cytokinesis occurs because the egg needs to have maximum yolk to nourish the embryo. This is why chicken egg is so big. The largest human cell is the egg. Diplotene arrest and meiotic arrest only occurs in humans (they will not be on exam).
