In humans,right-handedness is dominant over l | vedclass

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(A) In humans,right-handedness is a dominant trait,while left-handedness is a recessive trait.Let $R$ represent the dominant allele for right-handedne

Vedclass · Accepted Answer

Only left-handed

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(A) In humans,right-handedness is a dominant trait,while left-handedness is a recessive trait.Let $R$ represent the dominant allele for right-handedness and $r$ represent the recessive allele for left-handedness.$A$ left-handed individual must have the genotype $rr$ because the recessive trait is only expressed in the homozygous condition.If both parents are left-handed,their genotypes are $rr$ and $rr$.When these parents produce offspring,the only possible combination of alleles is $rr$ (as each parent can only contribute an $r$ allele).Therefore,all children will have the genotype $rr$,which corresponds to the left-handed phenotype.Thus,all children will be left-handed.

In humans,right-handedness is dominant over left-handedness. What can be expected for the children of two left-handed parents?

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