PSYC 2500 Lecture Notes - Lecture 2: Sickle-Cell Disease, Y Chromosome, Down Syndrome
19 Feb 2014
School
Department
Course
Professor
Document Summary
Gametes (sperm/egg cells) have 23 chromosomes each: combination of the 2 creates a cell. When combined, they provide 23 pairs of chromosomes. The first 22 pairs of chromosomes are autosomes and the 23rd pair is sex chromosomes (either x or y) Gender determined by 23rd chromosome pair: xx = female, xy = male. Female always donates an x chromosome, the male is the one who determines the sex by either contributing an x or y chromosome. Each chromosome is made up of dna (deoxyribonucleic acid) Genes are sections of the dna strands (50% genes from each parent) Genotype is one"s complete set of genes. Phenotype is one"s physical, behavioral, and psychological features. Guide the production of enzymes and proteins which feed cells. Guide cell differentiation: brain cells vs. other cells. Guide timing of development: genetically prewired to develop in a certain way, at a certain time.
