Additional slides from lecture 2

Genetics: A Conceptual Approach

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Unformatted text preview: Mitosis Important in :- Asexual reproduction (e.g. yeast)- Proliferation of somatic cells in multicellular organisms (e.g. skin cell) Mitosis Interphase Cell Cycle Mitosis G 1 G 2 S (DNA Synthesis) Cell Cycle Before S phase : Each chromosome = 1 DNA molecule = 1 chromatid Mitosis G 1 G 2 gene gene gene S (DNA Synthesis) Mitosis G 1 G 2 After S Phase : Each chromosome = 2 identical DNA molecules = pair of sister chromatids gene gene gene S (DNA Synthesis) Before S phase : Each chromosome = 1 DNA molecule = 1 chromatid Mitosis 4 chromosomes; each chromosome = pair of sister chromatids 8 chromosomes; each chromosome = one chromatid individual chromosomes line up chromatin condenses into chromosomes individual chromosomes separate Genetic Consequences of the Mitosis Mitosis produces two cells that contain the same genetic information No reduction in chromosome number A diploid parent cell divides and gives rise to 2 diploid daughter cells 2n 2n 2n Sexual Reproduction and Meiosis Whereas asexual reproduction and mitosis produce cells that are genetically identical Sexual reproduction provides a means to produce genetically variable offspring Sexual Reproduction Sexual reproduction consists of two processes: 1.Meiosis- process that leads to the production of gametes in which the chromosome number is reduced by half (haploid) 1. Fertilization- process in which two haploid gametes fuse and restore chromosome number to its original diploid value Meiosis homologous chromosome pairs...
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Additional slides from lecture 2 - Mitosis Important in :-...

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