3.2 Chromosomes - IB Questionbank | RevisionDojo

3.2 Chromosomes Questionbank

Practice 3.2 Chromosomes with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.

Paper

Level

Question 1

SLPaper 1A

Which sex chromosome(s) can be found in a human ovum?

Question 2

SLPaper 1A

Which is a characteristic of the pairs of sister chromatids that are visible during meiosis?

Question 3

SLPaper 1A

What is a difference between two alleles of a gene?

Question 4

SLPaper 2

The image shows the chromosomes from a body cell of an adult human. [Source: https://wccyusoueahdpdicsyrg.supabase.co/storage/v1/object/public/question-images/images/687f64f2-ce1c-44ad-993e-529a50a81c28.jpg, U.S. Department of Energy Human Genome Program.]

Identify, with a reason, the sex of this individual.

[1]

Identify the chromosome that is affected by a trisomy in this individual, naming the condition that this trisomy gives rise to.

[1]

Question 5

HLPaper 1A

Which individuals are colour blind in this Punnett grid?

	$X^{B}$	$Y$
$X^{B}$	$X^{B} X^{B}$	$X^{B} Y$
$X^{b}$	$X^{B} X^{b}$	$X^{b} Y$

Question 6

HLPaper 1A

A human cell has between 20000 and 25000 genes whereas an E. coli cell has approximately 4000 genes. Which of the following statements is true?

Question 7

SLPaper 1A

What are chromosomes with the same size, banding pattern, centromere location but with different alleles called?

Question 8

SLPaper 1A

John Cairns used the technique of autoradiography to produce photographs of DNA from the bacterium E. coli.

Which conclusion was drawn from his experiments?

Question 9

HLPaper 1A

For what purpose is a karyogram used?

Question 10

HLPaper 1A

Where can the entire genome of an organism be found?

Paper

Level

Question 1

SLPaper 1A

Which sex chromosome(s) can be found in a human ovum?

Question 2

SLPaper 1A

Which is a characteristic of the pairs of sister chromatids that are visible during meiosis?

Question 3

SLPaper 1A

What is a difference between two alleles of a gene?

Question 4

SLPaper 2

Identify, with a reason, the sex of this individual.

[1]

Identify the chromosome that is affected by a trisomy in this individual, naming the condition that this trisomy gives rise to.

[1]

Question 5

HLPaper 1A

Which individuals are colour blind in this Punnett grid?

	$X^{B}$	$Y$
$X^{B}$	$X^{B} X^{B}$	$X^{B} Y$
$X^{b}$	$X^{B} X^{b}$	$X^{b} Y$

Question 6

HLPaper 1A

A human cell has between 20000 and 25000 genes whereas an E. coli cell has approximately 4000 genes. Which of the following statements is true?

Question 7

SLPaper 1A

What are chromosomes with the same size, banding pattern, centromere location but with different alleles called?

Question 8

SLPaper 1A

John Cairns used the technique of autoradiography to produce photographs of DNA from the bacterium E. coli.

Which conclusion was drawn from his experiments?

Question 9

HLPaper 1A

For what purpose is a karyogram used?

Question 10

HLPaper 1A

Where can the entire genome of an organism be found?