PSYC 100 Chapter Notes -Sudden Infant Death Syndrome, Asymmetrical Tonic Neck Reflex, Congenital Heart Defect

• School: Queen's University
• Department: Psychology
• Course: PSYC 100
• Professor: Ingrid Johnsrude

Document Summary

Week 15 online lesson notes: lifespan development human development: before birth-->death. First stage of development; when a sperm cell fuses with an ovum (zygote, diploid) During this period, zygote divides many times through cleavage (24 hours after conception) Resulting cells held together in a sphere (morula) Conception in fallopian tubes, travels until it enters uterus. Lasts until developing cells have attached to uterine wall (8-10 days after conception) Sperm and ovum--> gametes, haploid (1/2 the chromosomes of a human) Epigenetic modification: even though all the dna of our cells are identical (except gamete cells), they are expressed differently--> different genes on/off, different expression of proteins and cell f"n. Stem cells: cells w/ the same dna as every other cell, but have not undergone epigenetic mod. Can become any type of cell (eg. cells of morula) Flexible in their development: any morula cell can potentially become the fetus (eg. identical twins) As morula enters uterus, uterus fills with fluid.