JAMB and WAEC Biology questions

791 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 401· Heredity and variation· WAEC
An allele that shows its effect only when two copies are present is
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Answer: B. recessive
Explanation and discussion
Question 402· Heredity and variation· WAEC
In humans, the sex of a child is determined by the
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Answer: A. father's sperm
Explanation and discussion
Question 403· Heredity and variation· JAMB
Colour blindness is more common in males because it is
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Answer: B. sex-linked and carried on the X chromosome
Explanation and discussion
Question 404· Heredity and variation· JAMB
The sex of a human child is determined by
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Answer: D. whether the sperm carries an X or a Y chromosome
Explanation and discussion
Question 405· Heredity and variation· JAMB
The bar chart shows the blood groups of 40 students. What percentage of the students have blood group O?
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Answer: A. 40%
Explanation and discussion
Question 406· Heredity and variation· WAEC
A couple already has four daughters. What is the probability that their fifth child will be a boy?
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Answer: C. 1/2
Explanation and discussion
Question 407· Heredity and variation· WAEC
Height in humans is an example of
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Answer: A. continuous variation
Explanation and discussion
Question 408· Heredity and variation· WAEC
The units of inheritance found on chromosomes are
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Answer: D. genes
Explanation and discussion
Question 409· Heredity and variation· JAMB
In DNA, the base adenine always pairs with
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Answer: B. thymine
Explanation and discussion
Question 410· Heredity and variation· JAMB
A test cross is a cross between an organism showing the dominant trait and one that is
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Answer: A. homozygous recessive
Explanation and discussion
Question 411· Heredity and variation· WAEC
The passing on of characteristics from parents to offspring is called
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Answer: C. heredity
Explanation and discussion
Question 412· Heredity and variation· WAEC
A man of blood group AB marries a woman of blood group O. What blood groups can their children have?
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Answer: D. A or B
Explanation and discussion
Question 413· Heredity and variation· JAMB
Blood group AB is an example of
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Answer: A. codominance
Explanation and discussion
Question 414· Heredity and variation· JAMB
Two heterozygous tall plants (Tt) are crossed. The expected ratio of tall to dwarf offspring is
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Answer: C. 3 : 1
Explanation and discussion
Question 415· Heredity and variation· JAMB
A homozygous tall pea plant (TT) is crossed with a homozygous short one (tt). The F1 plants are
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Answer: A. all tall (Tt)
Explanation and discussion
Question 416· Heredity and variation· WAEC
The physical appearance of an organism is its
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Answer: B. phenotype
Explanation and discussion
Question 417· Heredity and variation· WAEC
If a man of blood group AB marries a woman of group O, their children can have blood group
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Answer: C. A or B only
Explanation and discussion
Question 418· Heredity and variation· WAEC
A child has sickle-cell anaemia (SS) when he receives
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Answer: B. the sickle allele from both parents
Explanation and discussion
Question 419· Heredity and variation· JAMB
Two parents of genotype AS have a child. What is the probability that the child is SS?
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Answer: B. 1/4
Explanation and discussion
Question 420· Heredity and variation· WAEC
The sex chromosomes of a human male are
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Answer: C. XY
Explanation and discussion

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JAMB and WAEC Biology questions

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

The sex of a human child is determined by

The bar chart shows the blood groups of 40 students. What percentage of the students have blood group O?

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

Height in humans is an example of

The units of inheritance found on chromosomes are

In DNA, the base adenine always pairs with

A test cross is a cross between an organism showing the dominant trait and one that is

The passing on of characteristics from parents to offspring is called

A man of blood group AB marries a woman of blood group O. What blood groups can their children have?

Blood group AB is an example of

Two heterozygous tall plants (Tt) are crossed. The expected ratio of tall to dwarf offspring is

A homozygous tall pea plant (TT) is crossed with a homozygous short one (tt). The F1 plants are

The physical appearance of an organism is its

If a man of blood group AB marries a woman of group O, their children can have blood group

A child has sickle-cell anaemia (SS) when he receives

Two parents of genotype AS have a child. What is the probability that the child is SS?

The sex chromosomes of a human male are