Intro to evolution week 3 notes
Intro to evolution week 3 notes BZ 220
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This 2 page Class Notes was uploaded by Courtney Parks on Monday February 8, 2016. The Class Notes belongs to BZ 220 at Colorado State University taught by Angeloni, Lisa Maria in Fall 2016. Since its upload, it has received 66 views. For similar materials see Introduction to Evolution in Biology at Colorado State University.
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Date Created: 02/08/16
Introduction to Evolution Week 3 Vocab o Gene: sequence of DNA that codes for protein of RNA o Locus: position of gene on chromosome o Allele: one of the alternative forms of a single gene o Homozygous: in diploid organisms, an individual with the same allele on both chromosomes o Heterozygous: in diploid organisms, an individual with different alleles on each chromosomes o Genotype: genetic expression of gene o Phenotype: physical expression of genotype in particular environment o Segregation: alleles that stay separate and don’t join to make something new o Independent assortment: two unlinked genes are inherited independently of each other during meiosis Gamete contain a random assortment of combinations of alleles across different genes on different chromosomes Which tissues carry genetic info? o Germ line? Meiosis produces gametes o Soma All other tissues and cells o Pangenesis theory- incorrect Idea the soma contributes genetic material to sex cell o Germ plasm theory- correct Only gonads contribute genetic material to sex cell How is genetic info passed on? o Blending inheritance- incorrect Idea that allele comes from parents and they fuse together to create a new allele Early criticisms of natural selection o Thinking favorable types will be swamped by blending inheritance o Asking how do populations evolve past existing variation o Natural variation is too small to make a difference Gregor Mendel (1822-1884) o Experimented with varieties of peas Yellow vs. Green, Wrinkled vs. Smooth o Found dominance allele i.e. Yellow is dominant over green Expressed whenever part of the genotype o Found recessive allele Expressed only in homozygous genotype o Gene recombination generates endless variability Hugo De Vries (1848-1935) o Rediscovered Mendel’s work in 1900 o Discovered mutation Can rapidly create new species Discrete vs. continuous variation o Discrete variation Variation in qualitative trait that falls in distinct categories i.e. hair vs no hair o Continuous variation Variation in quantitative trait that falls along numerical continuum i.e. height
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