Meiosis: Creation of the Sex Cells. What is Meiosis?? Meiosis- creation of sex cells (eggs, sperm)...
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Transcript of Meiosis: Creation of the Sex Cells. What is Meiosis?? Meiosis- creation of sex cells (eggs, sperm)...
![Page 1: Meiosis: Creation of the Sex Cells. What is Meiosis?? Meiosis- creation of sex cells (eggs, sperm) Meiosis- creation of sex cells (eggs, sperm) Occurs.](https://reader034.fdocuments.us/reader034/viewer/2022052420/5a4d1b927f8b9ab0599c20e9/html5/thumbnails/1.jpg)
Meiosis: Creation of Meiosis: Creation of the Sex Cellsthe Sex Cells
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What What is is Meiosis??Meiosis?? MeiosisMeiosis- creation of sex cells (eggs, - creation of sex cells (eggs,
sperm)sperm) Occurs in testes in males, ovaries in Occurs in testes in males, ovaries in
femalesfemales At the end, 4 cells are created that At the end, 4 cells are created that
are NOT identical to the starting cell. are NOT identical to the starting cell.
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Karyotypes Karyotypes Display of the 46 chromosomes of an Display of the 46 chromosomes of an
individualindividual 23 23 homologous pairshomologous pairs of of
chromosomeschromosomes
Female Male
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Homologous ChromosomesHomologous Chromosomes Two chromosomes of each matching Two chromosomes of each matching
pairpair– 1 from mom & 1 from dad1 from mom & 1 from dad
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Diploid/ HaploidDiploid/ Haploid Diploid (2n)-Diploid (2n)- cells with 2 homologous cells with 2 homologous
sets of chromosomes (2n= 46 in sets of chromosomes (2n= 46 in humans)humans)
Haploid (n)-Haploid (n)- Single set of Single set of chromosomes (n= 23 in humans)chromosomes (n= 23 in humans)– Sex cells produced through meiosisSex cells produced through meiosis
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Human Life CycleHuman Life Cycle
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Mitosis vs. MeiosisMitosis vs. Meiosis MITOSISMITOSIS MEIOSISMEIOSIS
– Body cellsBody cells - Gametes- Gametes– Produces 2 identicalProduces 2 identical - Produces 4 - Produces 4
different cells (diploid)different cells (diploid) cells cells (haploid) (haploid)
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MeiosisMeiosis 2 parts- Meiosis I and Meiosis II2 parts- Meiosis I and Meiosis II
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VideoVideo MeiosisMeiosis
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Crossing OverCrossing Over Human offspring are genetically Human offspring are genetically
different from their parents…different from their parents… WHY??WHY?? Occurs during Occurs during Prophase IProphase I Homologous chromosomes exchange Homologous chromosomes exchange
some genetic materialsome genetic material Why is this important??Why is this important??
– Allows for more variation in the cells. Allows for more variation in the cells.
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Crossing OverCrossing Over
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Mitosis vs. MeiosisMitosis vs. Meiosis
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Mitosis vs. MeiosisMitosis vs. Meiosis Describe two differences between Describe two differences between
meiosis and mitosis.meiosis and mitosis.– 1) 1) – 2) 2)
VideoVideo