HSCI 100 Lecture Notes - Lecture 14: Seminiferous Tubule, Vas Deferens, Glans Penis
20 Apr 2016
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Document Summary
Dna in body and sex cells (review: body cells = somatic cells: Each body cell has 46 chromosomes (23 pairs) within the nucleus and divide by mitosis only. Cells that have pairs of chromosomes are called diploid (2n: sex cells = germ cells gametes: Gametes have only 23 chromosomes (1 of each pair) in their nuclei as a result of meiosis. Egg and sperm: differentiated germ cell products. Cells that have only 1 of each pair of chromosomes is called haploid (1n or n) During fertilization a sperm and egg combine to form a zygote and the chromosome number is restored to the diploid number of 46 or 2n. Germ cells in gonads develop into gametes in specialized compartments with support cells. The production strategies of gametes differs between: spermatogenesis. From meiosis, all 4 haploid cells generate sperm. About 400 million sperm are produced per day: oogenesis. During meiosis 1 egg and 2-3 polar bodies are formed.
