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Unformatted text preview: minutes. Genetics Chromosomes o Humans have 46 chromosomes in 23 pairs. o Males have the sex chromosomes XY and females have XX. o During gamete formation, the chromosomes of each pair of chromosomes separate; therefore half of a person's genetic makeup comes from the father and half from the mother. Genes o A gene is a portion of a DNA molecule. Genes determine the proteins in a cell. o Genes are paired (located on the paired chromosomes). o Dominant genes mask the effects of recessive genes. o Sex-linked traits result from genes on the sex chromosomes. o In incomplete dominance, the heterozygote expresses a trait that is intermediate between the two homozygous traits. o In codominance, neither gene is dominant or recessive, but both are fully expressed. o Polygenic traits result from the expression of multiple genes....
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- Fall '10