chapter 6

chapter 6 - 1 Genetics 1. Genes a. Found on chromosomes b....

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Genetics 1. Genes a. Found on chromosomes b. A unit of heredity that contains information about a trait c. A specific sequence of nucleotides that code for proteins d. 20,000-25,000 genes on each chromosome e. All body cells have the same genes, yet all cells do not use the same genes 2. Allele a. Variations of a gene b. Alternate versions of a gene 3. Gregor Mendel a. Laws i. Law of Segregation: separation of homolous pairs of genes during meiosis to form a gamete ii. Law of Independent Assortment (random alignment during meiosis): genes that are located on different pairs of chromosomes separate independently of each other to form gametes 4. Genotype: actual genetic make-up (pair of alleles) a. Heterozygous: pair of alleles that are different b. Homozygous: pair of similar alleles (both dominant or both recessive) c. Dominant: the gene (allele) is expressed over the recessive in the heterozygote d. Recessive: the gene (allele) is hidden in the heterozygote e. Carriers: looks normal but can pass over the allele to offspring
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chapter 6 - 1 Genetics 1. Genes a. Found on chromosomes b....

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