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Meiosis
Sexual Reproduction
Meiosis | An example of sexual reproduction |
Homologous Pairs | A pair of chromosomes (one from mom and one from dad) that are the same shape, same height, and have genes in the same place |
Purpose of Meiosis | To create gametes |
Gametes | Sex cells |
Female gamete | Egg (ovum) |
Male gamete | Sperm |
Cross over | When chromosomes exchange genetic material, it breaks off and reattaches to the other chromosome |
End Result of Meiosis | 4 haploid cells (23 chromosomes) that are all different |
Haploid | 1 set of chromosomes, or half the number of chromosomes |
Germ cells | Cells that reproduce using meiosis |
Purpose of Mitosis | Growth and repair of damaged tissues |
End result of Mitosis | 2 cells that look genetically identical |
Diploid | Two sets of chromosomes, or the total number of chromosomes of an organism |
Haploid number for humans | 23 |
Diploid number for humans | 46 |
Somatic cells | Body cells like bone, blood, skin, and hair |
Cells that reproduce using mitosis | Somatic cells |
Cells that reproduce using meiosis | Germ cells |
Fertilization | When the sperm fuses with the egg |
Cells that are haploid | Sperm or egg (ovum) |
Cells that are diploid | Somatic cells, like bone, blood, skin, anything except the gametes |
Zygote | A fertilized egg that contains 46 chromosomes |
Is the zygote haploid or diploid, and why? | Diploid, because two haploid cells (sperm and ovum/egg) fuse to make it diploid) |