ES 207 Chapter Notes - Chapter 19: Sloughing, Cryptorchidism, Semen Analysis
22 Dec 2016
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Document Summary
Sperm cells in the testes and oocytes in the ovaries. Duct system in male nourishes sperm until mature and are deposited on female reproductive tract. Nurtures the development of new individual in uterus. Hormones produced by reproductive system control development of the system and its form. Testes and ovaries produce gametes or sex cells. One cell undergoes two consecutive cell divisions to make 4 daughter cells. Each has half as many chromosomes as the parent cell. Two divisions of meiosis are called meiosis i and meiosis ii. Each division has a prophase, metaphase, anaphase, and telophase. Each of 46 chromosomes have 2 chromatids connected by centromere. The chromosomes align as pairs in a process called synapsis. Crossing over may occur: when the two chromatids are close together, occasionally part of a chromatid of one chromosomes breaks off and is exchanged with a part of the other chromosome. Chromosomes align along the center of the cell.
