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THE CREATION OF SPERM & EGGS (OVA) IN ANIMALS
MEIOSIS THE CREATION OF SPERM & EGGS (OVA) IN ANIMALS
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Humans have two sets of chromosomes so we note this as 2n
Gametes have only 1 set of chromosomes so we note this as n
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OOGENESIS- Creation of an egg
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Animation
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Meiosis has two Stages of Division
Why? Because it creates 4 cells and each can only have _____chromosomes. Meiosis I Prophase I, Metaphase I, Anaphase I, Telophase I Meiosis II Prophase II, Metaphase II, Anaphase II, Telophase II
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MEIOSIS I http://bcs. whfreeman. com/thelifewire/content/chp09/0902002
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MEIOSIS II
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Prophase I Crossing over of homologous chromosomes animation
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Prophase I Crossing over of homologous chromosomes animation
Sister chromatids
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MITOSIS V. MEIOSIS http://www.biologyinmotion.com/cell_division/index.html
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MITOSIS V. MEIOSIS CHART
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Sexual v. Asexual Reproduction
Asexual –creation of genetically identical offspring mostly simple, one cell organisms Only need one parent to produce offspring Shorter Development time, more offspring produced No genetic variety, pass on mutations easily Sexual –creation of genetically diverse offspring due to: 1. Crossing over 2. Independent Assortment of chromosomes 3. Random fertilization of gametes 4. Greater chance of favorable variations passed on
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Nondisjunction Failure of homologous chromosomes to separately evenly during mitosis or meiosis
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Types of chromosome mutations
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