PSYB20H3 Lecture Notes - Lecture 2: Behavioural Genetics, Waardenburg Syndrome, Twin
Document Summary
Cell division: mitosis vs. meiosis: meiosis vs mitosis. Mitosis simple division into 2 identical cells cell copy/replication. Meiosis produces germ cells requires additional processes. Split into 4 different combos of dna with cross-overe chromosome stuff. Sperm and egg cells only contain the dna for the next cell. Mitosis is regular cell division where they make an exact copy of themselves. Meiosis is when egg and sperm cells split o. Gene expression: genotype vs phenotype: genotype = your specific genetic makeup all the alleles that you have. Homozygous: alleles from the two parents are the same, Heterozygous: alleles are different: phenotype = how that genetic makeup is expressed what actually comes out in the individual o. 2 alleles one dominates dominate gene is expressed: codominance and incomplete dominance. 2 alleles - neither allele is dominant, or one is dominant but fails to completely hide effects of the other. Codominance: both alleles are expressed (i. e. dogs with patches of brown and white)
