2 - GENETICS - Meiosis Lesson.pdf

2 - GENETICS - Meiosis Lesson.pdf - Meiosis Meiosis:...

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2 ­ GENETICS ­ Meiosis Lesson 1 Meiosis Meiosis: the process of cell division which involves a reduction of the chromosome number to one half the normal number producing genetically diverse cells. Diploid cells are cells that contain pairs of chromosomes called "homologous chromosomes" . The number of chromosomes in these cells is called the diploid number and is equal to 2n ( n is the number of homologous pairs ). Haploid organisms/cells have only one set of chromosomes. The haploid number and is equal to n. These are sperm and egg cells . Meiosis ­ The chromosome numbers of a cell produced by meiosis are reduced by 1/2 ­ Haploid nuclei are formed which contain only one chromosome of the original homologous pair and are genetically different. ­ Meiosis ONLY occurs in the gamete producing cells of the gonads ( ovaries & testes ). ­ One of the main goals of meiosis is to mix up the combination of maternal chromosomes (from the mother) and paternal chromosomes (from the father) in a process called Random Assortment .
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2 ­ GENETICS ­ Meiosis Lesson 2 Meiosis The Process of Meiosis: involves two divisions the first divisions is a called Meiosis I the second divisions is a called Meiosis II creates gametes ( eggs or sperm ) Homologous chromosomes ­ a pair of chromosomes in which one
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