lecture1 - EVOLUTION, SEXUAL REPRODUCTION, SEXUAL...

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EVOLUTION, SEXUAL REPRODUCTION, SEXUAL DIMORPHISM, AND REPRODUCTIVE STRATEGIES
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Asexual (Not Sexual) reproduction 46 46 46
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Asexual reproduction was the only kind of reproduction from the time of the origin of life on earth, about 4.5 billion years ago, up to about 1-1.2 billion years ago, when sexual reproduction arose.
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Today: Asexual Reproduction is limited to: 1. Prokaryotic organisms 2. Protistas 3. Fungus – Most have sexual as well. 4. Few plants – Most have sexual reproduction as well. 5. One or two animals
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Prokaryotic cells Protista Animal - Hydra simple Cnidaria Plant – Grass that has runners
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Sexual Reproduction 46 23 23 23 23 23 23 Sperm or Eggs
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Meiosis and Mitosis Compared Egg or Sperm (23 Chromosomes )
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Human Chromosomes Male and Females both have 46 chromosomes 44 of them are autosomes 2 are sex chromosomes Females have XX Males have XY
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Human female karyotype Sex Chromosomes
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Human male karyotype Sex Chromosomes
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Eggs have 23 chromosomes 22 are autosomes 1 is an X (sex) chromosome Sperm have 23 chromosomes 22 are autosomes The sex chromosome can be either an X or a Y
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This note was uploaded on 04/24/2011 for the course BIO 388n taught by Professor Shank during the Spring '11 term at California State University Los Angeles .

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lecture1 - EVOLUTION, SEXUAL REPRODUCTION, SEXUAL...

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