Ch13 Meiosis

Ch13 Meiosis - Meiosis chapter 13 PowerPoint Lectures for...

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Click to edit Master subtitle style 11/10/10 Meiosis chapter 13 PowerPoint Lectures for Biology 8th edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions by Joan Sharp
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11/10/10 Concept 13.1: Offspring acquire genes from parents by inheriting Living organisms are distinguished by their ability to reproduce their own kind Genetics is the scientific study of heredity and variation Heredity is the transmission of traits from one generation to the next l DNA (genes) Variation is demonstrated by the differences in appearance that offspring
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11/10/10 Meiosis Meiosis allows heredity (passing of DNA) to occur without abnormal duplication of the DNA Meiosis also provides a mechanism to introduce variation Genes are the units of heredity, and are made up of segments of DNA l Each gene has a specific location called a locus on a certain chromosome Slight changes in nucleotide sequences in genes make them different in one
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11/10/10 Meiosis and chromosomes Genes for same trait, but slightly different.
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11/10/10 Homologous Chromosomes Homologous Chromosomes l These are chromosomes that contain the same genes (information about the same trait) and structurally look similar. Human somatic cells (any cell other than a gamete) have 23 pairs of chromosomes l A karyotype is an ordered display of the pairs of chromosomes from a cell
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11/10/10 Homologous Chromosomes
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11/10/10 Homologous Chromosomes Homologous Chromosomes l For each pair of homologous chromosomes, one chromosome came from Mom, and one came from Dad. l An exception to the rule of homologous chromosomes is found in the sex chromosomes , the X and the Y. Human females have a homologous pair of X chromosomes (XX). Human males have an X and a Y chromosome (XY). l The 22 pairs of chromosomes that do not
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11/10/10 Homologous Chromosomes - karyotype Sex Chromosomes Autoso mes
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11/10/10 Concept 13.2: Fertilization and meiosis alternate in Meiosis separates Homologous chromosomes and fertilization reunites them. A life cycle is the generation-to- generation sequence of stages in the reproductive history of an organism
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Diploid cells have homologous chromosomes q A diploid cell (2 n ) has two sets of chromosomes q This is the case for somatic cells q For humans, the diploid number is 46 (2 n = 46) q Remember: q In a cell in which DNA synthesis has occurred,
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This note was uploaded on 11/10/2010 for the course BIOL 111 taught by Professor K during the Spring '10 term at Indiana.

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Ch13 Meiosis - Meiosis chapter 13 PowerPoint Lectures for...

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