09-12 meiosis

09-12 meiosis - Meiosis Meiosis is nuclear division that...

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Meiosis Meiosis is nuclear division that precedes the formation of gametes (egg and sperm) and results in a halving of chromosome number. Chromosomes of the same type are called homologous chromosomes, or homologs. Chromosomes carry genes. A gene is a section of DNA that influences one or more hereditary traits in an individual. Different versions of a specific gene are called alleles. Homologs carry the same genes in the same locations, but each one may contain different alleles.
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Chromosomes
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Overview of Meiosis In meiosis I, the homologs in each chromosome pair separate and go to different daughter cells. Although the daughter cells are haploid ( 1n ), each chromosome still consists of two identical sister chromatids. During meiosis II, the sister chromatids of each chromosome separate and go to different daughter cells. At the end of meiosis II, there are four haploid daughter cells, each containing one copy of each chromosome. In animals, these daughter cells become gametes. In this way, each diploid individual receives both a haploid chromosome set from its mother and a haploid set from its father. Homologs are therefore referred to as being either maternal chromosomes, from the mother, or paternal chromosomes, from the father.
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Meiosis I Early Prophase I: The homolog pairs come together in a pairing process called
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This note was uploaded on 04/05/2012 for the course HLTH 311 taught by Professor Anderson during the Spring '12 term at BYU.

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09-12 meiosis - Meiosis Meiosis is nuclear division that...

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