CIE iGCSE Co-Ordinated Science B16.3 Monohybrid inheritance Exam Style Questions Paper 2
Question
Horn development in some cattle is controlled by a pair of alleles. The allele for not developing horns is dominant to the allele for developing horns.
The pedigree diagram shows cattle with and without horns.
How many of the cattle are definitely heterozygous?
(A) 2
(B) 3
(C) 4
(D) 5
▶️Answer/Explanation
Ans: C
Question
The pedigree diagram shows the inheritance of a recessive condition.
Which statements are correct with reference to this condition?
1 P and Q are both heterozygous for the condition.
2 Q and R have different genotypes.
3 P and R have the same genotype.
(A) 1, 2 and 3
(B) 1 and 2 only
(C) 1 and 3 only
(D) 2 and 3 only
▶️Answer/Explanation
Ans: C
Question
The diagram shows the inheritance of a disease.
▶️Answer/Explanation
Ans : B
Question
Cystic fibrosis is a genetic condition. The allele for cystic fibrosis is recessive. The diagram shows inheritance of cystic fibrosis in a family.
What is the chance of the next child having cystic fibrosis?
(A) 0% (B) 25% (C) 75% (D) 100%
▶Answer/Explanation
Ans :B