NSCI 1413 Lecture Notes - Lecture 1: Mesoglea, Cervix, Parthenogenesis
6 May 2017
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Document Summary
Produces offspring genetically identical to the parent. Enables animals living in isolation to reproduce w/o a mate. There is no expenditure of energy-maintaining reproductive systems or hormonal cycles. Since offspring are clones of the parent, it is advantageous when the environment is stable. Fission: the separation of an organism into two new cells (ex: amoeba) Budding: the splitting off of new individuals from existing ones (ex: hydra) Fragmentation/regeneration: when a single parent breaks into parts that regenerate new individuals. Parthogenesis: development of an egg w/o fertilization, resulting in a haploid adult (ex: honeybees, some lizards) The major advantage sexual reproduction has over asexual reproduction is variation (gives better chances of survival) The human female reproductive system: the urethra to survive prior to birth (stim. uterine contractions) during ejaculation ejaculation from the epididymis to the urethra. Testes: the male gonads; location of sperm production. Seminiferous tubules: site of sperm formation w/i testes. Epididymis: tube in the testes where sperm gain motility.
