(c) Show the inheritance of the tongue rolling in humans in the given example using a suitable cross. What percentage of offspring will show the same genotype as the parents?
Since, at least some progeny had the recessive trait , we can assume the parent’s genotype was not Homozygous dominant .
Therefore, 50% of the offspring will show the same genotype as the parents.
If one of the parents was a non-roller , their genotype would be rr .
Thus, the ratio of tongue roller to non tongue roller offspring = 1:1