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Biology 10

Chapter 9

meiosis 2 functions: reduce chromosome number shuffle chromosomes in the cell to produce genetically different gametes
meiosis 23 pairs or 46 total chromosomes=diploid (2n) Haploid number (n) in gametes---23 total chromosomes
meiosis 22 pairs of autosomes
meiosis Both males & females have 23 pairs of chromosomes
meiosis 1 pair of sex chromosomes : XX female or XY male
meiosis homologous pairs may contain different versions
meiosis alleles ----alternate form of a gene
homologous chromosomes members of a pair of chromosomes have the same size, shape, construction contain the same genes for the same traits
crossing over during prophase I, homologous chromosomes pair up and form a tetrad, a process called synapsis each tetrad conists of 2 chromosomes, w/each chromosome containing 2 chromatids = total of 4 chromatids
Created by: Rachelnck