ch13 - Chapter 13 Meiosis Two ways to reproduce: Asexually...

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Chapter 13 – Meiosis Two ways to reproduce: Asexually Sexually Figure 13.2 The asexual reproduction of a hydra Sexual reproduction Takes two! Chromosomes in homologous pairs share shape, genetic loci; carry same genes controlling same traits - alleles allele= alternate form of a gene(e.g. blue vs. brown eyes) Get one from each parent In humans o 22 pairs- autosomes o 1 pair sex chromosomes Female-two x chromosomes Male- one x and one y chromosome Normal Gametes have single set of chromosomes somatic cells = have 2 sets of homologues diploid (2n) = sex cells(gametes) have 1 set of homologues haploid (n) produced by meiosis Sexual life cycle involves alternation between diploid and haploid fusion of haploid gametes at fertilization results in diploid zygote Meiosis reduces chromosome number from diploid to haploid only in diploid cells that become gametes results = 4 haploid daughter cells two consecutive phases:
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ch13 - Chapter 13 Meiosis Two ways to reproduce: Asexually...

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