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Asexual Reproduction

Asexual Reproduction. recombination of genetic material More combinations means there is a higher chance at least some will survive a catastrophe Offspring not identical to parents. Sexual Reproduction. Union 2 haploid (1n) gametes (Such as Sperm and Egg)to form a diploid (2n) Zygote.

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Asexual Reproduction

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  1. Asexual Reproduction

  2. recombination of genetic material More combinations means there is a higher chance at least some will survive a catastrophe Offspring not identical to parents Sexual Reproduction

  3. Union 2 haploid (1n) gametes (Such as Sperm and Egg)to form a diploid (2n) Zygote Sexual Reproduction

  4. Diploid vs Haploid • These terms refer to the number of sets of chromosomes an organism has. • Humans are Diploid, we have two sets of chromosomes 46 total or 23 Pairs of “Homologous” chromosomes • Sperm and eggs are haploid they only have 23 chromosomes each. • When sperm and egg join the resulting zygote will have 46 chromosomes

  5. Homologous Chromosomes • Homologous means “Like” or “Same” • Homologous chromosomes are chromosomes that code for the same genes. Remember that a gene codes for a protein that may result in a trait. • The homologous chromosomes may have different version of the genes called “Alleles” They code for the same trait but may have different forms or colors.

  6. Meiosis • The process of making a haploid cell • Also known as a reduction division because the number of chromosomes is reduced in this process. • Two stages • Meiosis I • Meiosis II • Results in 4 haploid (1N) Gamates

  7. Meiosis I • DNA is Replicated • Homologous chromosomes line up in metaphase. • This is when genetic recombination can occur… so not all offspring from the same pair will be identical! Very important for variation within a population and for the rise of new species. • Results in 2 haploid cells

  8. Meiosis I

  9. Meiosis II • DNA in NOT replicated in the two haploid cells • chromatids separate and divide • results in 4 haploid (1n) cells.

  10. Meiosis II Prophase II Prophase II Metaphase II Metaphase II Anaphase II Anaphase II Telophase II Meiosis I results in two haploid (N) daughter cells, each with half the number of chromosomes as the original. Meiosis I results in two haploid (N) daughter cells, each with half the number of chromosomes as the original. The chromosomes line up in a similar way to the metaphase stage of mitosis. The chromosomes line up in a similar way to the metaphase stage of mitosis. The sister chromatids separate and move toward opposite ends of the cell. The sister chromatids separate and move toward opposite ends of the cell. Meiosis II results in four haploid (N) daughter cells. Meiosis II

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