3 - BIO 320 Lecture 3 Mitosis and meiosis sex determination...

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Unformatted text preview: BIO 320: Lecture 3 Mitosis and meiosis, sex determination and the chromosomal theory of heredity GENETIC VARIATION.....SEXUAL REPRODUCTION MAKES IT HAPPEN Consider the following diploids: AA AA Non-sexual reproduction aa aa Aa aa Sexual reproduction AA X (two copies of gene; most eukaryotic genetics involves diploid organisms). Chapter 4: 4-1, 4-3, 4-4, 4-9, 4-12, 4-16, 4-18, 4-20; QB D1-D26 THE MITOTIC CELL CYCLE: Metaphase: chromosomes align on the metaphase plate equi-distant between the two spindle poles. The cell can tell when the orientation is correct because of the tension created by pulling the connected sister chromatids in opposite directions. S: time of DNA synthesis when chromosome are replicated and sister chromatid cohesion is established centromere: where spindle microtubules attach cohesins--proteins which hold sister chromatids together G1: gap phase where growth occurs prior to DNA replication INTERPHASE G2: gap phase where growth occurs after DNA replication Prophase:...
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This note was uploaded on 06/03/2008 for the course BIO 320 taught by Professor N/a during the Spring '08 term at SUNY Stony Brook.

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3 - BIO 320 Lecture 3 Mitosis and meiosis sex determination...

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