PSYC 3404 Lecture Notes - Sandra Scarr, Prenatal Development, Down Syndrome
4 Feb 2014
School
Department
Course
Professor
Document Summary
In the womb: -gametes (reproductive cells) fuse to create zygote -monozygotic v. Dizygotic twints (identical v. fraternal) -infertility: inability to conceive after 18 months of trying. Genotype: underlying genetic material homozygous- alleles that contain similar information from each parent heterozygous- alleles that contain different information from each parent -phenotype: physical manifestation of your genetic inheritance. Development deviates-- causes: genetics, spontaneous mutation, environmental insult. Consequences: down syndrome (trysomy 21), sickle-cell anemia, tay-sachs disease, Transmission- nature and nurture intelligence- closer genetic link leads to more similar. Iqs, closer in age with sibling leads to higher correlation with iqs. Encouragement, educational, social involvement sandra scarr- gene-environmental influence -passive (usually newborns) -active (toddlerhood and up) -evocative (todlerhood and up) prenatal growth and change: conception- 100 mil. sperm produced daily. 400,000 ovum at birth, mature at puberty ovum + sperm = zygote germinal stage: Moment of fertalization --> 2 weeks blastocyst travels and implants in uterus.
