JAMB Biology questions

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

All topics Cell structure and organisation · 30 Cellular activities · 32 Co-ordination and control · 31 Ecology · 38 Evolution · 27 Excretion · 30 Growth · 27 Heredity and variation · 36 Nutrition · 34 Reproduction · 33 Respiration · 30 Support and movement · 28 Transport · 30 Variety of organisms · 32

Question 221· Heredity and variation· JAMB
The observable characteristics of an organism make up its
Explanation and discussion
Question 222· Heredity and variation· JAMB
A sudden, heritable change in a gene or chromosome is called
Explanation and discussion
Question 223· Heredity and variation· JAMB
Sickle-cell anaemia is caused by:
Explanation and discussion
Question 224· Heredity and variation· JAMB
A gene that shows its effect only when two copies are present is described as
Explanation and discussion
Question 225· Heredity and variation· JAMB
Mendel's first law is the law of
Explanation and discussion
Question 226· Heredity and variation· JAMB
Gregor Mendel carried out his experiments on heredity using the
Explanation and discussion
Question 227· Heredity and variation· JAMB
Mendel's first law states that
Explanation and discussion
Question 228· 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 229· Heredity and variation· JAMB
Colour blindness is more common in males because it is
Explanation and discussion
Question 230· Heredity and variation· JAMB
The sex of a human child is determined by
Explanation and discussion
Question 231· Heredity and variation· JAMB
The bar chart shows the blood groups of 40 students. What percentage of the students have blood group O?
Explanation and discussion
Question 232· Heredity and variation· JAMB
In DNA, the base adenine always pairs with
Explanation and discussion
Question 233· Heredity and variation· JAMB
A test cross is a cross between an organism showing the dominant trait and one that is
Explanation and discussion
Question 234· Heredity and variation· JAMB
Blood group AB is an example of
Explanation and discussion
Question 235· Heredity and variation· JAMB
Two heterozygous tall plants (Tt) are crossed. The expected ratio of tall to dwarf offspring is
Explanation and discussion
Question 236· Heredity and variation· JAMB
A homozygous tall pea plant (TT) is crossed with a homozygous short one (tt). The F1 plants are
Explanation and discussion
Question 237· Heredity and variation· JAMB
Two parents of genotype AS have a child. What is the probability that the child is SS?
Explanation and discussion
Question 238· Heredity and variation· JAMB
Two parents both have the genotype AS. What is the probability that their child will have the genotype SS?
Explanation and discussion
Question 239· Heredity and variation· JAMB
A person who carries the sickle-cell gene but does not suffer from the disease has the genotype
Explanation and discussion
Question 240· Heredity and variation· JAMB
Haemophilia is more common in men than in women because it is
Explanation and discussion

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JAMB Biology questions

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)

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?

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

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

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

Two parents both have the genotype AS. What is the probability that their child will have the genotype SS?

A person who carries the sickle-cell gene but does not suffer from the disease has the genotype

Haemophilia is more common in men than in women because it is