BIOL 1362 Lecture Notes - Lecture 47: External Fertilization, Internal Fertilization, Polyspermy
18 Feb 2017
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Document Summary
Sperm + egg = diploid zygote -> develops into an organism. Species that live in aquatic environments; tend to produce large numbers of gametes. Gametes survive in water; dry up in land. Environmental cues of gamete production: long days, warm water. Pheromones in gametes help distinguish that the gamete is the same species as another. Males deposit sperm into the reproductive tracts of females. Copulation - sexual intercourse; males deposit sperm directly into female reproductive tract. Males package their sperm in a spermatophore which is then placed into the female"s. Terrestrial animals and aquatic animals (penis) reproductive tract by either parent. In many species, sperm follow chemicals signals secreted by the egg. An organism can only have a set # of chromosomes, so only 1 sperm can fuse with an egg. 11 from mom, 11 from dad, 1 to determine your gender. Finally, the fusion of two gametes has to trigger development.
