Question

人体卷舌与非卷舌由一对等位基因R和r所控，某女孩的父母均能卷舌，但她不能卷舌。她的父母和她本人的基因型依次是

1. A.
   RR、RR、rr
2. B.
   Rr、Rr、rr
3. C.
   Rr、rr、Rr
4. D.
   RR、Rr、rr

Answer 1

B