PPP_Ch.7 - CHAPTER 7 Sex Determination and Sex Chromosomes...

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Unformatted text preview: CHAPTER 7 Sex Determination and Sex Chromosomes Dr. Sanghamitra Mohanty MAIN AREAS OF DISCUSSION: Sex differentiation Chlamydomonas Maize C. elegans Humans Drosophila Sex chromosomes Syndromes associated with abnormal sexual development Dosage compensation Temperature variation controls sex determination In multicellular organisms, it is important to distinguish between: primary sexual differentiation , which involves only the gonads where gametes are produced secondary sexual differentiation , which involves the overall appearance of the organism 7.1 Life Cycles Depend on Sexual Differentiation Individuals that contain only male or female reproductive organs are unisexual ( dioecious or gonochoric ). Individuals that contain both male and female reproductive organs are bisexual ( monoecious or hermaphroditic ), and can produce both male and female gametes. Some organisms ( e.g. Chlamydomonas ) spend most of their life cycle in the haploid phase, asexually producing daughter cells by mitotic division. Under unfavorable nutrient conditions, however, certain daughter cells function as gametes. In such species, the two gametes that fuse together during mating are not usually morphologically distinguishable. Such gametes are called isogametes . . Haploid gametes are of two mating types, mt and mt + ....
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This note was uploaded on 07/04/2011 for the course BIO 325 taught by Professor Saxena during the Fall '08 term at University of Texas at Austin.

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PPP_Ch.7 - CHAPTER 7 Sex Determination and Sex Chromosomes...

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