Some people can roll their tongue and this is a genetically controlled auto-somal
dominant character. [Roller = RR / Rr and Non-roller = rr]
A child who can roll the tongue has one brother who is a non-roller and two sisters who
are rollers. If both the parents are rollers, the genotypes of their parents would be ____.
i) RR x RR ii) Rr x Rr iii) RR x rr iv) rr x rr
TNSCERT Class 10 Biology Ch 1 Heredity and Evolution
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draw a punnet square using the second option (Rr x Rr) u get RR,rr,Rr and Rr. these are the genotypes of the child,the brother and the two sisters.
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