PSYC 1010 Lecture Notes - Lecture 3: Twin, Distant Relatives, Chromosome
24 Jan 2020
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Psyc 1010 lecture 3 notes basic principles of genetics and detecting hereditary influence: research methods. Genes are dna segments that serve as the key functional units in hereditary transmission. In family studies, researchers assess hereditary influence by examining blood relatives to see how much they resemble one another on a specific trait. If heredity affects the trait under scrutiny, researchers should find trait similarity among relatives: furthermore, they should find more similarity among relatives who share more genes, for instance, siblings should exhibit more similarity than cousins. In twin studies, researchers assess hereditary influence by comparing the resemblance of identical twins and fraternal twins with respect to a trait: the logic of twin studies hinges on the genetic relatedness of identical and fraternal twins. Identical (monozygotic) twins emerge when a single fertilized egg splits for unknown reasons: thus, they have exactly the same genetic blueprint; their genetic overlap is 100%.
