On the planet LongLiveRock, there is a recessive condition known as WhoAreYou. P

Question

On the planet LongLiveRock, there is a recessive condition known as WhoAreYou. People with this trait have an uncontrollable perform windmill guitar swings. The two alleles at the trait locus are labeled R (trait) and r (wild type). If the probability of transmitting an r allele is 0.54, then what is the probability that any child born to carrier parents will be unaffected (i.e., will not perform windmill guitar swings)? A. 0.75 B. 0.77 C. 0.81 D. 0.23 E. 0.79 Can you please show me the work? I want to understand. Thanks

Explanation / Answer

Probability of transmitting an r allele is 0.54. This is equal to 'q'.

p= 1-q = (1-0.54) =

Since 'windmill guitar swings' condition is recessive, so, 'rr' genotype will only have this condition.

Now, the cross between carrier parents would be Rr X Rr

1/4 children will be 'rr'. 3/4 children will be unaffected (with genotype 'RR' and 'Rr').

Therefore, the correct answer is A. 0.75

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