PSYC 100 Lecture Notes - Lecture 3: Zygosity, Twin, Cytosine

• School: Queen's University
• Department: Psychology
• Course: PSYC 100
• Professor: Jordan Poppenk

Document Summary

Nativism: we are born with knowledge already presented (gene decides) Empiricism: we obtain knowledge through observable facts and experiences (environment decides) Behaviour genetics: the study of genetic influences on behaviours. Dna: genetic material of all organisms that makes up chromosomes; resembles a twisted ladder, with strands of sugar and phosphates connected by rungs made from nucleotide molecules of adenine, thymine, guanine, and cytosine. 22 are called autosomes and the 23rd pair is made up of the x and y sex chromosomes. Almost all males have an xy pair; females have an xx pair. Chromosomes: threadlike structures in the nuclei of living cells; contain genes. Meiosis: each cell has only half of each pair of chromosomes. Gene: small units of dna that direct the synthesis of proteins and enzymes and result in the expression of inheritable traits. Locus: the point on the chromosome where a particular gene is located. Homozygous: each parent contributes the same allele for a particular gene.