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biol lec 1 - Bio Lecture 1 Important...

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Bio Lecture 11/9/10 1. Important terminology: -genes -chromosomes -diploid -homologous 2. What is meiosis and why is it important? 3. What happens during each phase of meiosis? Meiosis Chapter 10 Gene- · segment of DNA that serves as a unit of hereditary information Chromosomes- · structures in the cell nucleus that contain genes · Made up of chromatin (protein + DNA) · Visible under microscope during cell division Figure 10-4 in book Total chromosomes number per cell differs among species Humans- 46 Drosophila- 8 Cows- 60 Diploid number ^ Most eukaryotes have 2 copies of every chromosome in somatic (non-gamete) cells n- · haploid number= # of distinct chromosomes · =# of chromosomes in gamete cell The 2 copies of each chromosome are called homologous chromosomes · each member of the pair is a homolog · homologous chromosomes have: same length and same centromere placement and same genes Sexual Reproduction · 2 parents each pass on 1 copy of all of their chromosomes -In a haploid gamete (egg or sperm)
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