PSYC 2500 Lecture Notes - Lecture 3: Twin Study, Heritability, Robert Plomin

• School: Carleton University
• Department: Psychology
• Course: PSYC 2500
• Professor: Anne Bowker

Document Summary

Each cell in the human body has 46 chromosomes (23 pairs) Chromosomes are filled with dna = genetic blueprint. Specific segment of dna, responsible for the production of a specific protein. Allele: part of a gene, 2 alleles per gene. Genotype set of genetic traits a person inherits; the genetic blue print. Phenotype set of traits a person actually displays. Dominant genes- only need to inherit from one parent. Recessive genes- need to inherit from both parents. Down"s syndrome (trisomy 21), and extra 21st chromosome. Any changes in genetic info (extra or less) = abnormality. Sex chromosome disorder: turner syndrome, x, kleinfelter"s syndrome, xxy (has an extra x, fragile x , xx or xy (males are more affected) Have to inherit recessive allele from both parents. Have to be on special diet for life: autosomal dominant. Only need to inherit 1 allele from either parent. Huntington"s disease: recessive genes on the x chromosome.