PSY 2105 Lecture 5: Genetics & Prenatal Development

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2105
• Professor: Kim Yurkowski

Document Summary

Genetics: the basics : cells are composed of three divisions: 3) cell membrane: wraps the cell: chromosomes: Rod-shaped portions of dna: 23 chromosomes pairs (total of 46 chromosomes per cell, autosomes: 22 of the 23 pairs, sex chromosomes = 23rd pair, males are xy and females are xx, dna: Carries genetic information that determines the nature of every cell in the body and how it will function. Basic unit of genetic information: alleles: Genes for the same trait are located in the same place on a pair of chromosomes. Result: two cells identical to the original, containing 23 pairs of chromosomes each: meiosis: Result: four genetically unique cells, containing 23 chromosomes each. Genetic inheritance: mendel"s studies: mendel based his work on pea plants, principle of dominance: genetic traits are not equal. Recessive gene: less likely to become manifest (d: phenotype vs. genotype. A trait is determined by a number of genes.