document.write( "Question 63960This question is from textbook mathematical ideas
\n" ); document.write( ": Assume that a trait is determined by a single pair of genes where one allele is dominant and the other is recessive. Suppose a hybrid mates with a pure dominant. If they produce two offspring, what is the probability that neither is a hybrid? \n" ); document.write( "
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Assume that a trait is determined by a single pair of genes where one allele is dominant and the other is recessive. Suppose a hybrid mates with a pure dominant. If they produce two offspring, what is the probability that neither is a hybrid?
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\n" ); document.write( "It sounds like the hybrid has a dominant and a recessive and the
\n" ); document.write( "pure dominant has two dominants.
\n" ); document.write( "So we want the probability that neither of two offspring are hybrid.
\n" ); document.write( "Both would have to have two recessive or two dominant.
\n" ); document.write( "P(2 recessive in one birth) = (1/4)(1/4)=1/16
\n" ); document.write( "P(2 recessive in two births)=1/16*1/16=1/256
\n" ); document.write( "P(2 dominant in one birth)= 3/4*3/4=9/16
\n" ); document.write( "P(2 dominant in two births)=9/16*9/16=81/256
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\n" ); document.write( "Prob(neither are hybrids in two births)=1/256*81/256=81/65536
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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