PSYC 2013 Lecture Notes - Lecture 7: Sickle-Cell Disease, Homo Sapiens, Miscarriage
Document Summary
Why are developmental psychologist so very interested in twins: ability to examine nature and nurture. Recessive disorder: sickle cell disease (different shaped cells, helped with malaria, cystic fibrosis. Recessive conditions on the x chromosome: hemophilia, duchenne muscular dystrophy, fragile x. Genetic counseling/testing: who should get it, parent, sibling, child with serious genetic condition, several spontaneous abortions or stillbirths, women over 35, men over 40, couples from same ethnic group, especially if relatives. If you want to hear: the risk is severe and verified, an experienced counselor explains the risk, treatment is available. Germinal period (14 days: zygote, most dangerous journey, 60% of zygotes do not grow or implant properly. Implants at 10 days, doesn"t get nutrition until then. Embryonic (2 weeks to 8: embryo, 1 gram, 1 inch, all basic parts (except sex organs, 20% miscarriage (spontaneous abortion, cephalocaudal development (head, proximodistal development (torso - out)
