Answer:
Some people have an index finger that is longer than their ring finger; we'll call this long index finger, or L. Others have an index finger that is shorter than their ring finger (S). This is said to be a sex-influenced trait. In males, the allele for S is said to be dominant, while the allele for L is said to be dominant in females. Thus SS and SL males will have short index fingers and only LL males will have long index fingers, while SS females have short index fingers and SL and LL females have long index fingers.
Explanation:
