BIO 191 Lecture Notes - Lecture 13: Telophase, Metaphase, Sister Chromatids
4 Apr 2016
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Each homolog should have the same genes and its partner. Humans have 23 chromosomes and humans have 46 chromosomes . Egg to chicken to egg----------2n= 78 in a chicken so n= 39. Cells do a reductional division -----------cuts # of chromosomes in half during formation of the sex cells which is called meiosis. Each member of a pair has the same genes. Humans have 23 pairs/types of chromosomes, but 46 molecules of dna. Haploid chromosome #= n (n=23 in humans) Diploid chromosome #= 2n (2n=46 in humans) Goal of meiosis is to reduce the number of chromosomes from diploid to haploid. Homologs line up (synapse) along their lengths (prophase i) No, after recombination cohesin still connects sister chromatids together. Chromosomes interact with spindle to move around. Meiosis and mitosis alternate throughout the life cycle. Animals, plants, and fungi have different haploid and diploid phases during the life cycle. In meiosis you have to pair the homologs.
