Chapter 4 notes - Chapter 4: Evolution, Genetics, and Human...

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Chapter 4: Evolution, Genetics, and Human Variation Adaptation: After several generations of selection, gene frequencies will change—this is adaptation through natural selection The traits that are the most adaptive(favored by natural selection) in the environment will be selected again and again through each generation This is directional selection Dominant and Recessive: The dominant trait can mask the other form in mixed individuals—it dominates the recessive The recessive is dominated by the dominant trait but it is not destroyed or changed Chromosomes— genes/alleles are located on chromosomes. Humans have 46, arranged in 23 matching pairs. One in each pair from the father and one from the mother. Gene: determines a particular biological trait—such as blood type Allele: A biochemically different form of a give gene Heterozygous : Mixed—each has two dissimilar alleles of a given gene Homozygous: possessed two identical alleles of a given gene Genotype: hereditary makeup—what you really are genetically Phenotype: Expressed physical characteristics—what you appear as
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Chapter 4 notes - Chapter 4: Evolution, Genetics, and Human...

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