PSY203 Lecture Notes - Lecture 2: Mendelian Inheritance, Egg Cell, Mitosis
Document Summary
Principles of hereditary transmittion: dvlpmnt begins at conception (when sperm penetrates ovum, new cell is formed zygote, consists of 46 chroms (23 from each parent, provide biological basis for dvlpmnt, mitosis, zygote grows quickly, prod. Of body cells: zygote replicates through mitosis, each division duplicates chroms, each new cell contains 46 we inherited at conception. *diagram of mitosis: one way zygote divides from fallopian tube to uterine wall, germ cells prod sperm & ova, prod. Gametes through meiosis: duplication of 46 chrom. s, crossing over adjacent chroms. Break & exchange segments of genes: pairs of duplicated chrom. s segregate into two new cells, cells divide, 23 single chroms, hereditary uniqueness. Independent assortment each chrom pair segregates independently, resulting in genetic uniqueness: *why germ cells are imptnt. 1: ova contain x"s, sperm x or y, m determine sex of child, what do genes do, prod.
