NATS 1690 Lecture Notes - Three Steps, Epistasis, Stamen
4 Nov 2013
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Document Summary
2n = 4 first step- contains two homologous pairs of chromosomes. Second step - dna replication during interphase forms two copies of each chromosome, and the copies remain attached. Third step meiosis 1 homologous chromosomes separate into two haploid cells, each containing one member of each homologous pair. Fourth step - meiosis 2 sister chromatids separate and four haploid daughter cells are formed that will develop into gametes. Haploid gametes sperm and egg cells. Increases genetic variability in the population through genetic recombination. Failure of chromosomes to separate creates cells with extra or missing chromosomes. Duplicated homologous pair of chromosomes align and separate. Found in gonads ovary, testis, anther. Each cell has pair of homologous chromosomes. Each has one member of each homologous pair. Union of gametes restores diploid number in zygote. The exchange of dna material between homologous chromosomes. Genetic recombination (mixture of dna from the 2 parents) . Results in new combinations of alleles on chromosomes .
