CH 50 Sexual reproduction - Asexual advantages-Single...

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Asexual advantages -Single parent Disadvantages -Identical to parent -Difficult to evolve Ex- Sponges, cnidarians, rotifers, flatworms Fission- Fragmentation- Adult is broken up and each fragment gives rise to offspring Ex- Annelids, Parthenoogenesis Unfertilized egg develops into adult which Is typically haploid. Sexual Reproduction Promotes genetic variety Disadvantages Less efficient Requires more energy than asexual reproduction 2 Haploid gametes Sperm is motile Ovum- nonmotile Methods External fertlixation - Release eggs and sperm in water Internal Fertlization - Sperm deposited into females reproductive trak Zygote(fertilized egg) - Union of sperm and egg to form first diploid cell of new individual Hermproditism - Single individual produces both eggs and sperm(monocious) - Tape worm self fertilize Absence of male hormones- female is produced Chromosome 19 - AMH gene Sertoli cells
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- Stimulates involulation of mullerian ducts Intersitstial cells of Leydig - Stimualtes differntation of wolffian ducts Y chromosome - SRY—sex determining region of Y chromome - TDF testis determining factor - Must be present in first 9 weeks in development
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