JAMB and WAEC Biology questions: Heredity and variation

60 questions with answers and explanations. Tap an option to check yourself.

All topics Cell structure and organisation · 56 Cellular activities · 56 Co-ordination and control · 58 Ecology · 71 Evolution · 45 Excretion · 52 Growth · 45 Heredity and variation · 60 Nutrition · 64 Reproduction · 62 Respiration · 55 Support and movement · 50 Transport · 57 Variety of organisms · 60

Question 1· Heredity and variation· JAMB
Colour blindness is commoner in males because the gene is
Explanation and discussion
Question 2· Heredity and variation· JAMB
What genotypes are possible among the children of an AS father and an AA mother?
Explanation and discussion
Question 3· Heredity and variation· WAEC
In a monohybrid cross, the ratio of tall to short plants in the F₂ generation is
Explanation and discussion
Question 4· Heredity and variation· JAMB
The number of chromosomes in a normal human body cell is:
Explanation and discussion
Question 5· Heredity and variation· JAMB
Two parents both have blood group A with genotype AO. What is the probability that their child has blood group O?
Explanation and discussion
Question 6· Heredity and variation· WAEC
The genotype of a person who is a carrier of sickle cell is
Explanation and discussion
Question 7· Heredity and variation· JAMB
A couple already has three daughters. What is the probability that their fourth child will be a boy?
Explanation and discussion
Question 8· Heredity and variation· JAMB
The observable characteristics of an organism make up its
Explanation and discussion
Question 9· Heredity and variation· JAMB
A sudden, heritable change in a gene or chromosome is called
Explanation and discussion
Question 10· Heredity and variation· JAMB
Sickle-cell anaemia is caused by:
Explanation and discussion
Question 11· Heredity and variation· JAMB
A gene that shows its effect only when two copies are present is described as
Explanation and discussion
Question 12· Heredity and variation· JAMB
Mendel's first law is the law of
Explanation and discussion
Question 13· Heredity and variation· JAMB
Gregor Mendel carried out his experiments on heredity using the
Explanation and discussion
Question 14· Heredity and variation· JAMB
Mendel's first law states that
Explanation and discussion
Question 15· Heredity and variation· JAMB
A father has blood group A (genotype AO) and the mother has blood group B (genotype BO). Their children could have blood group(s)
Explanation and discussion
Question 16· Heredity and variation· WAEC
A person with blood group O can donate blood to people of
Explanation and discussion
Question 17· Heredity and variation· WAEC
Which of these shows continuous variation?
Explanation and discussion
Question 18· Heredity and variation· WAEC
An allele that shows its effect only when two copies are present is
Explanation and discussion
Question 19· Heredity and variation· WAEC
In humans, the sex of a child is determined by the
Explanation and discussion
Question 20· Heredity and variation· JAMB
Colour blindness is more common in males because it is
Explanation and discussion

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JAMB and WAEC Biology questions: Heredity and variation

Colour blindness is commoner in males because the gene is

What genotypes are possible among the children of an AS father and an AA mother?

In a monohybrid cross, the ratio of tall to short plants in the F₂ generation is

The number of chromosomes in a normal human body cell is:

Two parents both have blood group A with genotype AO. What is the probability that their child has blood group O?

The genotype of a person who is a carrier of sickle cell is

A couple already has three daughters. What is the probability that their fourth child will be a boy?

The observable characteristics of an organism make up its

A sudden, heritable change in a gene or chromosome is called

Sickle-cell anaemia is caused by:

A gene that shows its effect only when two copies are present is described as

Mendel's first law is the law of

Gregor Mendel carried out his experiments on heredity using the

Mendel's first law states that

A father has blood group A (genotype AO) and the mother has blood group B (genotype BO). Their children could have blood group(s)

A person with blood group O can donate blood to people of

Which of these shows continuous variation?

An allele that shows its effect only when two copies are present is

In humans, the sex of a child is determined by the

Colour blindness is more common in males because it is