PSY 2114 Chapter Notes - Chapter 2: Gestational Age, Fetus, Preterm Birth

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2114
• Professor: Heather Poole

Document Summary

Chapter 2: from conception to birth: life begins. Zygote: single cell that is formed from fusion of sperm and egg. Dna: chemical instructions (made up of chromosomes, made up to genes) Allele: type of gene (trait), variations among people. Genome: full set of genes for certain species. Monozygotic twins: twins who originate from one zygote (ideal genetic instructions) Dizygotic twins: two separate ova are fertilized by two separate sperm at same time. Additive genes: gene that contributes to the phenotype (add up to make the phenotype) Dominant-recessive pattern: phenotype reveals dominant gene more than recessive gene. Carrier: genotype is not expressed in the phenotype. X-linked: traits expressed on x genes: from zygote to newborn, germinal period: rst two weeks of development. Rapid cell division and the beginning of cell differentiation. Stem cells: cells from which any other specialized type of cell can form. Embryo: developing human organism from 2-8 weeks after conception: embryonic period: second to 8 week.