Psychology 1000 Lecture Notes - Lecture 12: Fetal Alcohol Spectrum Disorder, Umbilical Cord, Fallopian Tube

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Laura Fazakas- De Hoog

Document Summary

Developmental psychology examines changes in biological, physical, psychological, and. Prenatal development: ovulation mature egg released and picked up by fallopian tubes, ~300 million sperm in ejaculate (~2000 sperm, conception has occurred when one sperm penetrates egg. First trimester- external body parts and internal organs have been formed. Fetus is ~4 inches: weights oz, looks like a small infant. 24th week- sensitive to light and sound, vigorous arm and leg movements. Third trimester (6-9 months: skin loses downy hair & wrinkly appearance, moves into birth position with head down, last 2 months rapid weight gain. Average newborn 7. 5 lbs & 20 inches long. Genetics and sex determination: dependent on the x or y chromosome present in sperm, xx -female; xy -male, y chromosome (male) contains tdf (testis-determining factor) gene which initiates development. 23rd pair of chromosomes determines the baby"s sex of testes at around 6-8 weeks: testes then secrete androgen.