DEP-3103 Chapter Notes -Genomic Imprinting, Allosome, Umbilical Cord
Document Summary
Chapter 3 biological foundations, prenatal development, and birth. Mother"s or father"s alleles are chemically marked and thus activated. Polygenetic inheritance: characteristics inherited on a continuum. Height, weight, intelligence, personality: determined by many genes that form a nice distribution. The course of prenatal development: prenatal development. Zygote: 2 weeks fertilization; implantation; start of placenta (cid:222) Embryo: 6 weeks arms, legs, face, organs, muscles all develop; heart begins beating (most growth happens in this time) Fetus: 30 weeks growth and finishing : fertilization. Rapid cell division: stem cells at work. Make up inner-cell mass that attaches to cell wall: period of the zygote. Placenta permits food and water to reach developing organism, carries waste away. Umbilical cord delivers blood: period of the embryo. Ectoderm will become nervous system in the skin (cid:222) mesoderm becomes the muscles, skeleton, and circulatory system (cid:222) (cid:222) (cid:222) (cid:222) (cid:222) (cid:222) (cid:222) Endoderm digestive system, lungs, urinary tract, and glands.
