Ch13 - Reproductive Anatomy How do we reproduce?...

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Reproductive Anatomy How do we reproduce?
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Spermatogenesis
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Oogenesis
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The next question: Why do we all look so different???
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Asexual Reproduction One parent produces genetically identical offspring by mitosis Can you think of any disadvantages? Figure 13.2 Parent Bud 0.5 mm
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Sexual Reproduction Two parents give rise to offspring that have unique combinations of genes inherited from two parents
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Units of Inheritance Genes Are segments of DNA Each gene has a specific locus on a certain chromosome We inherit one set of chromosomes from our mother and another from our father karyotype 5 µ m Pair of homologous chromosomes Centromere Sister chromatids Figure 13.3
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Chromosomes Each somatic cell has 46 chromosomes One set (23) comes from each parent Homologous chromosomes --pairs of chromosomes having the same characteristics Same banding patterns, gene sequence, etc.
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Chromosomes Autosomes --22 homologous pairs Sex chromosomes --the 23rd pair, not homologous Represented by an X and a Y Determine the sex of the individual XX = female XY = male
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Each cell in the body (except RBC’s and gametes) contains 46 chromosomes Diploid (2 n = 46; so n = 23) After S-phase, each chromosomes consists of two sister chromatids Somatic Cells
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Sex Cells Gametes (sperm and egg) are haploid cells Only contain one set of chromosomes In humans they have 23 ( n = 23) Produced by ovaries and testes through meiosis During fertilization, two haploid gametes fuse to form a zygote The zygote will develop into the adult organism
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The Human Life Cycle Figure 13.5 Key Haploid ( n ) Diploid (2 n ) Haploid gametes ( n = 23) Ovum ( n ) Sperm Cell (n) MEIOSIS FERTILIZATION Ovary Testis Diploid zygote (2 n = 46) Mitosis and development Multicellular diploid adults (2 n = 46)
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Meiosis Reduces the number of chromosome sets from diploid to haploid Reduction division (Meiosis I) Equational division (Meiosis II)
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This note was uploaded on 11/01/2011 for the course BIO 181 taught by Professor Staff during the Summer '10 term at BYU.

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Ch13 - Reproductive Anatomy How do we reproduce?...

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