Biology 10 Notes On Genes, Chromosomes, Mendel's Laws, And Mitosis Vs. Meiosis

720 words - 3 pages

Gene: segment of DNA that controls design or structure of a trait/characteristic of the cell or organism. In the most multicellular organisms 2 copies of the segment of DNA, termed Alleles, interact to give the particular form of the trait as seen. Autosomal Gene: Gene located on an autosomal chromosome which is any of the 22 human chromosomes (or 3 Drosophila chromosomes) other than the X or Y. Autosomal genes are never sex-linked. Sex-linked Gene: Gene located in the unpaired region of the X chromosome or on the Y chromosome. These genes tend to be seen in males. Mendelian Organism: Organism whose patterns of heredity follow Gregor Mendel's 3 laws and tend to give offspring in phenotypic ratios of 3:1, 1:1, 9:3:3:1, and 1:1:1:1 Mendel's Laws: Laws of Dominance, Law of Segregation of Genes, and Law of Independent Assortment of Genes. Note: Mendel was wrong in his final Law because he did not know about Linkage; it should have read the "Law of Independent Assortment of Chromosomes". Codominance: Non-Mendelian condition in which there are 3 different alleles for a gene. 2 of these alleles are different dominant versions of the gene. Therefore the possibility of A/B exists giving an AB blood type. Gene Pool: Total of all alleles for a particular gene in a population. Particular allele/mutation could be rare as in albinism or relatively common as in diabetes or cystic fibrosis. Down's Syndrome: Partial triploid condition in humans where there are 3 copies of chromosome 21. Unfortunately there are many physical problems (heart, liver, kidney, brain, & facial) that are visible Turner's Syndrome: Partial haploid condition in humans where there is no pair in the X chromosome (often...

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