PSYC 1010 Lecture 24: Chapter 11 - Childhood - Part 1 - Lecture Notes

• School: York University
• Department: Psychology
• Course: PSYC 1010
• Professor: Myriam Mongrain

Document Summary

Chapter 11 childhood part 1 lecture notes: prenatal development, conception. 300 million sperms competing for 1 egg. 23 chromosomes of egg and sperm unite when sperm reaches eggs nuclei. X chromosome = boy; y chromosome = girl. Travels to uterine wall & implants (7th day) 2 weeks to 8 weeks first trimester embryotic stage. Placenta whatever is traveling in her bloodstream is being passed onto to the embryo. Most miscarriages happen during the first trimester. At 9 weeks; second trimester heart is developed enough to hear a heartbeat. Development of sexual orientation happens during second trimester depending on how much circulating hormones in the wombs. Most sensitive period is when the female doesn"t know they are pregnant. Risk of spontaneous abortions and fetal death still births (baby born dead) Lower birth weight not birth defect. Higher risk of death in 1st year. Women who drink heavily per day while pregnant.