Psychology 1100E Lecture Notes - Lecture 9: Nucleic Acid Structure, Phenotypic Trait, Phenotype

• School: Western University
• Department: Psychology
• Course: Psychology 1100E
• Professor: Cheung, Hessel, Dumas, Cole

Document Summary

The dna is so tightly were stretch out, it would be almost 2 metres long. Dna portion of the chromosome carries the hereditary blueprint in units called genes. Dominant, recessive, and polygenic effects: genotype: the specific genetic makeup of an individual. The total ge(cid:374)eti(cid:272) e(cid:374)do(cid:449)(cid:373)e(cid:374)t i(cid:374)he(cid:396)ited f(cid:396)o(cid:373) o(cid:374)e"s pa(cid:396)e(cid:374)ts: phenotype: the observable characteristics produced by the genetic endowment. Thus, blue eyes will only appear if both partners contribute blue eye genes: polygenic transmission: when several gene pairs combine their influences to create a single phenotypic trait. Epigenetics: first used in 1940, to refer to lasting change in gene expression, concerns lasting changes in gene function caused by external or environmental factors without any changes in the dna sequence itself. Involves activating or silencing specific genes or altering how a gene is expressed thus changing the gene product. For example, a process called dna-methylation will turn a ge(cid:374)e (cid:862)off" p(cid:396)e(cid:448)e(cid:374)ti(cid:374)g it fo(cid:396)(cid:373) a(cid:272)ti(cid:374)g(cid:863)