PSY E112 Lecture Notes - Lecture 9: Amniotic Sac, Trophoblast, Prenatal Development
Document Summary
What walks on four legs in the morning, two legs during the day and three legs in the evening - Examining behaviour and mental processes in prenatal environment. Observe behaviour (looking inside environment or looking for consequences) Conception: single sperm and ovum fuse into zygote (diploid-both sets of chromosomes; full set of genetic info. ) marks first stage of development (germinal period- lasts 8-10 days) Gametes: specialized type of reproductive cell (sperm and ova); are haploid. Zygotic cell numerously divides (into identical copies) through process called cleavage (division of cells in the early embryo to form blastomeres); 24 hours after conception (contains one set of chromosomes) in fallopian tube. New cells called morula (solid mass of blastomeres) epigenetic modification: regulation of gene expression leads to diff. expression of proteins and thus diff. cellular properties and functions. Stem cells have not undergone epigenetic modification.
