CAS PS 241 Lecture Notes - Lecture 4: Cell Nucleus, Egg Cell, Mitosis
21 Sep 2016
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No two people share one except for identical twins. Expression of the genotype in observable or measurable characteristics. Do not directly affect behavior, it is indirect. Ex: genes can make you prone to alcoholism, but don"t force you to drink. Genes can cause differences in proteins and their impact on. Dna: deoxyribonucleic acid, what genes are made of physiological systems that cause behavior. Specifies proteins and enzymes that will be active during development. Chromosomes: groups of dna, found in body cells (somatic) and gametes (sex cells) Cell nucleus has 46 chromosomes arranged in 23 pairs (one from mom, one from dad) Gametes have 23 single pairs that combine at fertilization between sperm and ovum. Identical daughter cells, allows us to start as zygote and become multicellular, complex beings. Meiosis: reduction division, sex cells (46 to 23 chromosomes) 2^23 possible combinations between mom and dad, and crossing over allows for even more variation.
