Biology 1201A Chapter Notes - Chapter 9: Ploidy, Sexual Reproduction, Zygote
3 Dec 2015
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Document Summary
Genetic recombination requires the following: two dna molecules that differ from one another, a mechanism for bringing the dna molecules into close proximity, and a collection of enzymes to cut , exchange , and paste the. Most of the recombination discussed in this chapter occurs between regions of. Dna that are very similar, but not identical, in the sequence of bases. Homology allows different dna molecules to line up and recombine precisely. Once homologous regions of dna are paired, enzymes break a covalent bond in each of the four sugar=phosphate. The free ends of each backbone are then exchanged and reattached to those of the other dna molecule. Sexual reproduction: the mode of reproduction in which male and female parents produce offspring through the union of egg and sperm generated by meiosis. Gametes: a haploid cell; an egg or sperm. Haploid cells fuse during sexual reproduction to dorm a diploid zygote.
