1Lecture 13SelectionSelection Against a Recessive Gene-- The problem is the recessive alleles is hidden in the heterozygotes. In natural populations there is nothing more. With artificial selection can target heterozygotes. --Purging complete families is often impractical. Also for many species males are more important reproductively than females.Design a progeny testfor screening potential parents.Progeny test-- create progeny to learn about parent genotypes
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2Consider the following example:Mating between Bb and bb °1/2Bb +1/2bbPossible OutcomesProgenyGenotypesBbbbP(outcome) 30.125.12521.37512.37503.125P(all Bb)Consider the following example:Possible OutcomesProgenyGenotypesBbbbP(outcome) 30.125.12521.37512.375.87503.125P(at least one bb) or probability of seeing the b allele from Bb parent. Progeny Test Program.Bb × Bb3 B_ + 1 bb1/3 BB + 2/3 BbProgeny Test:B_ × bbn = 3 progeny observed