3 types of cells

3 types of cells - chromatid into each of two more daughter...

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-3 types of cells -mitosis vs meiosis (diploid vs haploid) Meiosis is a specialized cell division process that produces haploid gametes Meiotic cell division occurs in animal ovaries and testes for sexual reproduction to take place Meiotic cell division involves a specialized division called meiosis , and two rounds of cytokinesis Two divisional steps produce four daughter cells that can become gametes Daughter cells are genetically different from the parent cell and from each other Each daughter cell has half the genetic material of the parent cell -chromosome components (allele,loci,centromere) Kaytype,homologues,automes,se chromosomes Mitosis steps:interphase(g1,s,g2) mtitic divison/cytokinesis Meiosis steps: 2 divisons The first division, meiosis I , separates the pairs of homologues, with each daughter nucleus receiving one pair The second division, meiosis II , separates the chromatids and parcels one
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Unformatted text preview: chromatid into each of two more daughter nuclei Gist of cloning Cloning – To clone an animal, the chromosomes are removed from a donor egg (haploid à no DNA) – The diploid set of chromosomes from a normal cell is injected into the egg (no DNA à diploid) – The now-diploid egg carries only chromosomes from the donor cell (genetic clone/identical) rather than mixing chromosomes from a sperm and egg Cancer,mutations,carcinogens = uncontrolled cell division due to DNA mutations that cause the cell cycle regulation (checkpoints) to fail – 3 checkpoints means that there must also be multiple DNA mutations to cause them to fail – 2 kinds of cancerous mutations: – Genes that mutate to constantly promote cell division (gas pedal stuck to the floor) – Suppressor genes mutate to be inactive (parking brake is broken)...
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This note was uploaded on 11/19/2011 for the course BIO 1320 taught by Professor Farr during the Fall '08 term at Texas State.

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