BIO 202 Chapter 13: Chapter 13 Learning Objectives
Document Summary
Dna sequences are not identical and the protein products that are specified by the genes are not identical either. We have pairs of homologous chromosomes, chromosome 1 from our mom and chromosome 1 from our dad; same for all diploid cells. The corresponding homologous chromosomes pair up with one another so they could separate. All chromosomes going into meiosis already exist as a pair of sister chromatids. When meiosis i begins, there are 92 chromosomes. At the end of meiosis i, there are two daughter cells each consisting 46 chromosomes. At the end of meiosis ii, there are four daughter cells each consisting of 23 chromosomes. Meiosis ii separation of sister chromatids; same thing as mitosis. Random fertilization 8 million possible gametes from mom and 8 million possible gametes from dad, then the overall number of possible zygotes is (8 mil)(8 mil) = 70 trillion.