MITOSES AND MEIOSIS

May 20th, 2015
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Inheritance – is the transfer of genetic information from generation to generation. Chromosomes – a thread like structure made up of genes (genes are units of inheritance made of DNA (deoxyribonucleic acid) in that it codes for a specific protein).

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BiologyChapter 16Inheritance is the transfer of genetic information from generation to generationChromosomes a thread like structure made up of genes (genes are units of inheritance made of DNA (deoxyribonucleic acid) in that it codes for a specific protein). They are found inside the nucleus and are only visible when a cell is dividing.Diploid nucleus a nucleus containing two sets of chromosomes (46 chromosomes) (from mother and father)In division, first nucleus divides and then cytoplasm. There are two ways in which nuclei divides:Mitosis is the type of nuclear division that occurs during growth and asexual reproduction. The daughter cells are genetically identical.Meiosis occurs in sex organs to form gametes. The daughter cells are not genetically identical.Mitosis before cell divide, new copies of genetic information in the DNA of the chromosomes must be made. Copying process occurs before nucleus divides. In bone marrow stem cells continually divide through all life to produce RBC and phagocytesMitosis occurs in following processes:Growth it happens all over the body in animals, in plants it happens in special growing areas.Repair of wounds skin divides by mitosisReplacement of cells that wear out and die, eg RBCAsexual Reproduction occurs in fungi and plants, and its rare in animal kingdom.Meiosis it halves the number of chromosomes of egg cells and sperm cells to only have 23 chromosomes. The zygote has 46

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