Biology 1201A Chapter Notes - Chapter 9: Genetic Recombination, Sister Chromatids, Covalent Bond
Document Summary
2 dna molecules that differ from one another: a mechanism for bringing the dna molecules into close proximity, a collection of enzymes to cut exchange and paste the dna back together. Meiosis: a specialized process of cell division that recombines dna sequences and produces cells with half the number of chromosomes present in the somatic cells of a species: halving of chromosome numbers (haploid) Fertilization: nuclei of an egg and sperm cell fuse together produce a zygote cell: restoration of chromosome numbers (diploid) 9. 3a meiosis occurs in different places in different organismal life cycles. Animals: follow the phase in which the diploid phase dominates the life cycle. Plants and some fungi: alternate between haploid and diploid generations. 9. 3b meiosis changes both chromosome number and dna sequence process of meiosis involves: halved chromosome number recombined chromosomal dna sequence. In multicellular animals and plants, meiosis occurs only in specialized tissue that produce gametes and spores, respectively.
