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(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?
Answer:
(C1)
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.
| R | r | |
| R | RR | Rr |
| r | Rr | rr |
(C2)
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
