What’s up with allele frequencies??1. How can O+ be the most common of the blood types if it is the expression of a recessive allele?2. Since Huntington’s disease comes from a dominant allele, shouldn’t three quarters of the population be affected?3. Shouldn’t recessive lethal alleles gradually disappear from populations?
Allele FrequenciesAllele frequency in a two-allele system:p= the proportion of one allele q= the proportion of the other allele p + q= 1
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Let’s say pis the proportion of r+ (orange fur) alleles in the Fraggle population and qis the proportion of r (green fur) alleles in the Fraggle population.Let’s also say that p = ½ and q = ½.1.) What’s the probability of a Fraggle having TWO r+ alleles?3.) What’s the probability of a Fraggle having ONE r+ allele and ONE r allele?2.) What’s the probability of a Fraggle having TWO r alleles?[Read as: “The probability of having an r+ allele is 1/2, and the probability of having an r allele is 1/2.”]