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There is a dwarfing allele (D) in White Leghorn chickens, which reduces body size from 5 lbs (DD, DD) to 3 lbs (DD) on
There is a dwarfing allele (D) in White Leghorn chickens, which reduces body size from 5 lbs (DD, DD) to 3 lbs (DD) on average. There is also a reduction in the annual egg production from 290 eggs/year (DD), to 280 eggs/year (DD) to 220 eggs/year (DD). Egg size also goes down a bit too, but not enough to affect egg value. The frequency (q) of the dwarf gene D2 is 9pts a) Complete the table below for both body weight and annual egg production for your flock. Body Weight D D Egg Production DD Genotype Frequency Phenotypic Value(Pi;) Flock Mean Genetic Value(Gij) 1 02 D D DD 55% D D DD Breeding Value(Aj) What would be the expected phenotypic deviation of progeny of each rooster if you mated him to a random group of hens in your flock? Progeny deviation Population Genetics: p+q=1 4NmNf Effective Number = Ne Nm+Nf Pop. Mean = P = pP1 + 2pqP12 +qP22 Genetic Value = G = Pj - P Allelic Effects (a's): =pG1 + qG12 Selection: Dominant allele desired: q' = (p+q)=p+2pq+q = 1 (1-hs)2pq+2(1-s)q 2[1p+(1-hs)2pq+(1-s)q] n= Mean = Frequency x Value pq 2Ne Drift Standard Deviation = Offspring Phenotype = (BVsire + BVdam)/2 Breeding Value = A = + = PG12 + qG2z Aq=q'- q When h=0 (complete dominance and dominant allele desired) When h=1 (complete dominance and recessive allele desired) Qualitative Traits: Recessive allele desired: q' = (1-hs)2pq+2q 2[(1-s)p+(1-hs)2pq+1q] Aq = -sqp/(1-sq) Aq=sqp/[1-s(1-q)] Testing for carrier genotypes, where n = number of offspring observed: Level of Confidence=1 - (Prob. of desired phenotype)"=1-(1-9s9d)" In(1-Level of Confidence) In(1-9s9d)
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