PSYC 1101 Lecture Notes - Lecture 4: Twin Study, Twin, Gene Expression
11 Oct 2016
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Gene expression- whether a particular gene is turned on or off. O(cid:374)e"s ge(cid:374)es a(cid:374)d e(cid:448)er(cid:455) e(cid:454)perie(cid:374)(cid:272)e o(cid:374)e e(cid:448)er has i(cid:374)flue(cid:374)(cid:272)e the de(cid:448)elop(cid:373)e(cid:374)t of o(cid:374)e"s brain. Cell division is the basis of the life cycle and is responsible for growth and development. Behavioral geneticists use two methods to assess the degree to which traits are inherited: twin studies and adoption studies: twin: compare similarities between different types of twins to determine the genetic basis of specific traits. Monozygotic twins (identical)- result from one zygote dividing into two. Dizygotic twins(fraternal) result when two separately fertilized eggs de(cid:448)elop i(cid:374) the (cid:373)other"s (cid:449)o(cid:373)(cid:271) si(cid:373)ulta(cid:374)eously. Monozygotic twins are more similar than dizygotic twins is most likely due to genetic influence: adoption studies- compare the similarities between biological relatives and adoptive relatives. Nonbiological adopted siblings may share similar home environments, but they will have different genes. The assumption is that similarities among nonbiological adopted siblings have more to do with environment than with genes.
