BIO120H1 Lecture Notes - Lecture 4: Chromosome, Gregor Mendel, Human Height
36
BIO120H1 Full Course Notes
Verified Note
36 documents
Document Summary
Darwin"s theory: variation: among individuals, heredity: resemble parents more than unrelated, selection: some forms better at surviving and breeding in a given environment. Genotype: genetic constitution of an organism- use din relation to a particular gene or gene combo. Phenotype: the organism observed- used when discussing a trait or a feature of an organism that varies. Genome: the entire organism"s dna (genes and non- coding regions) What is a gene: function unit of inheritance, unit of hereditary info located on chromosome, a dna sequence composed of codons. Genetic variation comes from: mutation - the ultimate source of all genetic variability, rates are low, recombination- occurs from generation to generation, gene flow- movement of genes in and out of a population, hybridization- between different species. Independent assortment and recombination: occurs during meiosis, most genetic variability occurs as a result of sexual reproduction, mutations in fruit flies: homeotic mutation: misplaced structure (e. g. leg where antenna should be)
