Out of a population of 60 people in a small town in KY, 1 person has blue skin (an autosomal recessive trait). 3 people are carriers for the trait.
A. How many total alleles (blue and normal) are in the gene pool for this trait?
B. What are the allelic frequencies for this trait?
C. What are the genotypic frequencies for this trait?
D. If the original population produces 140 children, how many offspring will be carries for blue skin?
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1) 20 alleles
Those 20 alleles are the gene pool for that locus. The set of all alleles at all loci is the full gene pool for the species. Over time, the size of a gene pool changes. The gene pool increases when a mutation changes a gene and the mutation survives (see How Evolution Works for details)
2) An allele frequency is calculated by dividing the number of times the allele of interest is observed in a population by the total number of copies of all the alleles at that particular genetic locus in the population. Allele frequencies can be represented as a decimal, a percentage, or a fraction.
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