| The family tree shows the inheritance of a condition caused by the recessive allele 'r'. |
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| Which of the females are certain to have the genotype Rr? |
A) 1, 6 and 7
B) 1, 7 and 12
C) 7, 9 and 15
D) 9, 12 and 15
Correct Answer: C
Solution :
[c] Parent 3 is certain to have the genotype rr. Since, the male 10 is also having the genotype rr, this means that parent 4 must have the genotype Rr. Therefore, female 9 must have the genotype Rr. As female 13 has the genotype rr, both her parents (7 and 8) must have the genotypes Rr. Female 15 must have the genotype Rr because her father (male 10) has the genotype rr and her mother (female 11) is normal.
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