Cambridge IGCSE · Biology (0610)

Monohybrid inheritance: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Monohybrid inheritance.

10 questions23 marksFree, no account

Question 1

1 mark

What is the correct biological definition of an allele?

Question 2

1 mark

A woman with blood group AB has a child with a man who has blood group A. Which blood group cannot be present in any of their offspring?

Question 3

1 mark

A woman is a carrier for the sex-linked recessive condition hemophilia (\(X^H X^h\)). If she has a son with a man who does not have hemophilia (\(X^H Y\)), what is the probability that this son will have the condition?

Question 4

1 mark

Which term describes the observable features of an organism resulting from its genetic make-up and its environment?

Question 5

1 mark

What is the main purpose of performing a test cross in monohybrid inheritance?

Question 6

2 marks

Using the terms dominant and recessive, explain why an individual with the genotype \(Bb\) displays the same phenotype as an individual with the genotype \(BB\).

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Question 7

3 marks

In a species of plant, the allele for tall stems (\(T\)) is dominant to the allele for short stems (\(t\)). Calculate the phenotypic ratio of offspring produced from a cross between a heterozygous plant (\(Tt\)) and a homozygous recessive plant (\(tt\)).

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Question 8

5 marks

A man with blood group AB and a woman with blood group O have a child. Calculate the percentage probability that the child will have blood group B.

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Question 9

3 marks

In a species of pea plant, the allele for purple flowers (P) is dominant over the allele for white flowers (p). A scientist crosses two plants to study the inheritance of flower color.

(a) Define the term genotype.
(b) A plant has the genotype \(Pp\). State whether this plant is homozygous or heterozygous and identify its phenotype.
(c) If this \(Pp\) plant is allowed to self-pollinate, identify the two types of gametes it can produce.

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Question 10

5 marks

In humans, the sex of an individual is determined by the inheritance of sex chromosomes (X and Y).

(a) Identify the genotype of a human male and a human female regarding their sex chromosomes.
(b) Provide a Punnett square to show the possible genotypes of the offspring produced when a male and a female reproduce.
(c) Using your Punnett square, explain why the probability of a couple having a male child is always \(50\%\). Support your answer by mentioning the gametes produced by the father.

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