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Chapter 4 Genetics

Chapter 4 Genetics - genes present are recessive •...

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Chapter 4: Genetics Genetics Gentetic science emerged after Darwin. DNA (deoxyribonucleric acid) Mendelain Genetics - Studies the ways in which chromosomes transmit genes across generation Biochemical Genetics - Examines structure, function, and changes in DNA. Population Genetics - Investigates natural selection and other causes of genetic variation, stability, and change in breeding populations. (doesn't really apply to humans) Genetics - Mendel's Experiments Gregor Mendel - Austrain monk who's experiments on pea plants revealed the basic principles of genetics. His results were statistical ratios - identified unknown underlying forces. Dominant - MAsks te traits of recessive genes. Recessive - Masked by dominate traits, will express themselves only if both
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Unformatted text preview: genes present are recessive. • Chromosomes - Structures containing genes - humans have 46, 23 pair from each parent. • Genes - A unit of DNA material that determines a biological trait. • Alleles - Biologically different forms of a given gene. • Heterozygous - Having one dominate and one recessive gene for a trait. • Homozygous - Having both genes for a trait the same - either dominant or recessive. • Genotype- Hereditary makeup, actual genes present (i.e., Brown-Brown, Brown-Blue, Blue-Blue) • Phenotype - Physical characteristics expressed by genes (i.e., brown or blue eyes) • Blood type • Eye color...
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