# Definition - the allele from mother does not affect the...

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Definition: p( a ) =  n a = number of outcomes that satisfy condition  a N = total number of outcomes (of equal probability) Probability problems can be solved by accounting for every outcome, but usually it is easier to combine probabilities. p(paralyzed F2 fly) = p(inherit  shi- from mother and inherit  shi- from father) Product rule: p( a and  b ) = p( a ) x p( b ) (note the product rule only applies if  a and  b are independent which is the case here since
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Unformatted text preview: the allele from mother does not affect the allele from the father) p( shi– from mother) = 1/2 p(paralyzed) = 1/2 x 1/2 = 1/4 p(not paralyzed) = 1 – 1/4 = 3/4 Thus in the F2 generation the phenotypic ratio will be, 1 paralyzed : 3 not paralyzed A 1 : 3 phenotypic ratio among the F2 in a breeding experiment shows that alleles of a single gene are segregating....
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