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The Law of Biogenesis = all living organisms come from other living organisms. Through the process of reproduction (fertilization), parents produce offspring. Each parent transmits one-half of their genetic information to the offspring. All of the inheritance (genetic material) an individual possesses comes from its parents. ¾ The genetic combination is set at fertilization and doesn’t change during the life of the individual (except for mutations). THE CELL: ¾ NUCLEUS = heart and brain of cell; contains the chromosomes which direct the synthesis of materials necessary for life ¾ Body cells & Sex Cells THE CHROMOSOMES: carry the hereditary material - GENES ¾ Present in PAIRS in the body cells; pairs are homozygous, meaning they are similar , but not necessarily exact duplicates since they may carry different genes. Diploid number. ¾ Present as SINGLES in the sex cells (GAMETES). Two sex chromosomes known as X and Y. They are responsible for the difference between male (XY) and female (XX). The X chromosome is larger than the Y. Haploid number
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This note was uploaded on 01/16/2012 for the course ANSCI 319 taught by Professor Donhenneke during the Fall '11 term at Tarleton.

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