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Ch42outline - Animal Reproduction 42 Animal Reproduction...

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Animal Reproduction      42  Animal Reproduction 42.1 How Do Animals Reproduce without Sex?  42.2 How Do Animals Reproduce Sexually? 42.3 How Do the Human Male and Female Reproductive Systems Work? 42.4 How Can Fertility Be Controlled and Sexual Health Maintained? 42.1 How Do Animals Reproduce Without Sex? Asexual reproduction requires no mating but does not result in genetic diversity. Asexually reproducing species are mostly invertebrates, sessile, and live in constant  environments. Three types of asexual reproduction are  budding regeneration , and  parthenogenesis . ______________--  produces new individuals that form from the bodies of older animals. A bud grows by mitotic cell division and cells differentiate before the bud breaks away. The bud is genetically identical to the parent. __________________  can replace damaged tissue or may form a complete individual. Example: Echinoderms  __________________  is the development of offspring from unfertilized eggs. Parthenogenesis may determine the sex of the offspring.                  In some species, females can act as males depending on cyclic states of estrogen and  progesterone.   42.2 How Do Animals Reproduce Sexually? In sexual reproduction two haploid cells form a diploid individual. _________________  produces haploid gametes through meiotic cell division. Meiosis allows genetic diversity through  crossing over , between homologous chromosomes,  and  independent assortment .    Three fundamental steps of sexual reproduction: Gametogenesis: making gametes
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Fertilization: fusing gametes Gametogenesis occurs in the  _____________.  In males the gonads are the  ________________  and the gametes are small, motile  _________ . In females the gonads are the  ovaries  and the gametes are nonmotile  ______ ,   or eggs. Gametes are produced from  __________-- , which occur early in development and are distinct  from the rest of the body. All other embryonic cells are called 
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This note was uploaded on 04/18/2008 for the course BIO 1306 taught by Professor Adair,tamarah during the Spring '08 term at Baylor.

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Ch42outline - Animal Reproduction 42 Animal Reproduction...

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