AlleleExercises - ANTH 150 Human Adaptation Chapter 3...

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ANTH 150 Human Adaptation Chapter 3 Evoluation Alleles & Genes Human Male Human Female Human chromosomes contain 20,000-25,000 genes . Genes come in pairs (1 on each chromosome). Variations of genes are alleles . A person may have 2 different alleles ( hetero zygous ), 2 of the same alleles ( homo zygous ), or even be missing a gene and so have only 1 allele (hemizygous). Alleles are described as dominant , recessive , or codominant . When 2 of the same alleles are paired (homozygous pair), the expression of the gene ( phenotype ) will be for that allele. When 2 different alleles are paired (heterozygous pair), the dominant allele will be expressed for that pairing unless they are co- dominant, in which case both will be expressed. Gene Pair Phenotype Gene Pair (blood type) Phenotype PP AA pp BB Pp AB Ao Bo Oo pair of chromosomes (1 from Mo, 1 from Fa) sex chromosomes (male = XY, female = XX) Pairs 1-22 are autosomal chromosomes (autosomes) Dominant alleles are usually described with a capital letter; recessive alleles with a lower case letter.
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This note was uploaded on 04/28/2011 for the course ANTH 150 taught by Professor Pietrusewsky during the Fall '10 term at University of Hawaii, Manoa.

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AlleleExercises - ANTH 150 Human Adaptation Chapter 3...

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