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Two parents were known to be right-handed. Assuming that right-handed (R) is dominant to left-handed (r), what would be the genotypes of the parents if their son is left-handed?

Sagot :

Both parents would have Rr genotype.

To check, Rr x Rr = RR, 2Rr, rr.
rr represents the genotype of the left-handed son.