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Lecture 15

ANTH 1210 Lecture 15: Lecture 15

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ANTH 1210
Haskel J.Greenfield

Oc982 Variability: produces change to transform species Conservatism: preserves family resemblance Haploid cells: half of genes for mitosis (sperm, egg) Diploid cells: full complement of genes Zygote: fertilized egg (diploid set) Meiosis: haploid cell, both parents Mitosis: diploid cell, one parent Homozygous cell: contains a pair of identical alleles for a trait (if two are identical), recessive trait is expressed Heterozygous cell: if both alleles are different, dominant traits expressed Genotype: actual genetic composition of an organism Phenotype: physical appearance of the organism Dominant trait is expressed phenotypically even in a heterozygous state Recessive trait is expressed phenotypically only in a homozygous state Monogenic: one location (ex: eye colour) Polygenic: more than one location (ex: weight, height) Mutation: Change in gene frequency Any random alteration in a gene Caused by: recombination during meiosis, transcription error during recombination LECTURE 7: Genes and Populations: Basic units of evolution (units upon which natural selection acts individuals) Population: evolution acts through genes of individuals upon groups of people Evolutionary forces acts no upon individual genes or individual person, but acts upon population through genes, gene combinations and individuals Population is a group of organisms Each member is more likely to mate (interact) with another member (than with an outsider) Similar to definition of society Biological Population:
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