Reproductive & Endocrine Notes

Reproductive & Endocrine Notes - Reproduction &...

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Asexual reproduction: involves only 1 parent and produces a new organism genetically identical to parent. Examples include budding, mitosis, binary fission, parthenogenesis, and regeneration. Conjugation : sexual process where genetic material is exchanged via cell-to-cell contact. Ex: algae may have different mating strains. A “connecting tube” forms between strains. Fungi can also undergo conjugation. May have positive (+) and negative (-) hyphae. Bacteria can conjugate, but there is no increase in numbers, so technically it is not sexual reproduction . Sexual reproduction: fusion of genetic material (egg and sperm) from two parents. Provides genetic variation and results in an increase in numbers. (Internal or external fertilization, alternation of generations, pollination) Many invertebrates use one or BOTH means of reproduction. Sexual reproduction can be internal or external . If it is external, eggs and sperm are deposited outside of the body and usually requires that a large number of eggs be released to enhance the chances of fertilization. (some inverts, fish, amphibians) External needs to be in a moist environment so that the sperm can swim to the eggs and so that the eggs don’t dry out. With internal fertilization, eggs are fertilized in an oviduct while they are within the female body. Internal fertilization does not require water. Animals that reproduce sexually can be described as: (Ovi, ovo = egg, Viv = live) Oviparous : young develops in and obtains nutrients from an egg. The egg incubates for some time outside of the mother. (amphibians, reptiles, most fish, all birds) Ovoviviparous: young develops in and obtains nutrients from an egg. The egg develops inside of the mother and the young are born live or they hatch almost immediately after birth. (sharks) Viviparous:
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This note was uploaded on 11/12/2010 for the course BSCI BSCI 110B taught by Professor Johnson during the Spring '09 term at Vanderbilt.

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Reproductive & Endocrine Notes - Reproduction &...

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