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Chapter 7: Sex Determination

Chapter 7: Sex Determination. Life cycles and reproductive modes *Asexual reproduction – formation of new individuals from the cell(s ) of a single parent. *Sexual reproduction – reproduction through the fusion of gametes.

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Chapter 7: Sex Determination

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  1. Chapter 7: Sex Determination Life cycles and reproductive modes *Asexual reproduction – formation of new individuals from the cell(s) of a single parent. *Sexual reproduction – reproduction through the fusion of gametes. *Alternation of generations – alternation of forms or of mode of reproduction in the life cycle of an organism. Some additional terms: *Primary sexual differentiation *Secondary sexual differentiation *Unisexual, dioecious and gonochoric *Bisexual, monoecious and hermaphroditic

  2. Chlamydomonas

  3. Caenorhabditiselegans (C. elegans)

  4. X and Y Chromosomes: Early Studies 1906 Edmund B. Wilson and Protenor

  5. X and Y Chromosomes: Early Studies Wilson and Lygaeus

  6. X and Y Chromosomes: Early Studies Homogametic sex – sex which produces uniform gametes with respect to sex chromosomes. Heterogametic sex – sex which produces gametes with unlike sex chromosomes. *The male is not always the heterogametic sex… Examples: Moths, butterflies, most birds, some fish, reptiles, amphibians, at least one species of plants

  7. XX XY Chromosome Composition in Humans Karyotype

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