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Answer:
Both of her parents have a cleft chin but she doesn't
Explanation:
<u>Alleles </u>
C - NOT a cleft chin (dominant gene)
c - a cleft Chin (recessive gene)
<u>Possibilities of Genotype</u>
CC - NOT a Cleft chin
Cc - NOT a Cleft chin (since C is dominant )
cc - a Cleft chin
Now, we both know that her parents have Cleft chin, which means that both of them could only have cc as their genotype.
This mean, if they have children ,both the father and the mother could only give c alleles. This make the possibilities of their child having a cleft chin become 100%.
If the girl does not have a cleft chin, we can say that she is 100% not the biological child of the parents.
