ch46 - Chapter 46: Animal Reproduction Sexual and Asexual...

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Chapter 46: Animal Reproduction Sexual and Asexual Reproduction Sexual reproduction: fusion of haploid gametes forms a diploid cell (zygote); animal that develops from the zygote can give rise to gametes by meiosis ; female gamete (egg) is a large, non-motile cell, male gamete (sperm) is a much larger, motile cell Asexual reproduction: generation of new individuals without the fusion of egg and sperm; in most asexual animals, reproduction relies entirely on mitotic cel division Fission: The separation of a parent organism into two individuals of approximately equal size Budding: the process in which two individuals arise from outgrowths of existing ones Parthenogenesis: a form of asexual reproduction in which an egg develops without being fertilized 1. The progeny of parthenogenesis can be either haploid or diploid 2. If haploid, the offspring develop into adults that produce eggs or sperm without meiosis The vast majority of eukaryotic species reproduce sexually-sex must enhance reproductive success or survival Reproductive cycles and patterns Ovulation: the release of mature eggs, occurs at the midpoint of each cycle Hermaphroditism: the process in which each individual has both make and female reproductive systems (an evolutionary solution for sessile animals such as
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This note was uploaded on 02/16/2010 for the course BIOLOGY V23.001100 taught by Professor Atmar during the Spring '07 term at NYU.

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ch46 - Chapter 46: Animal Reproduction Sexual and Asexual...

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