Pearson Edexcel IGCSE · Biology

Inheritance: Practice Questions

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

10 questions29 marksFree, no account

Question 1

1 mark

In DNA molecules, the two strands are held together by paired bases. Which of the following correctly identifies the base that pairs with cytosine (C)?

Question 2

1 mark

Which of the following statements correctly describes a key difference between the products of mitosis and meiosis in human cells?

Question 3

1 mark

A section of DNA has the following base sequence: T A C G G C A T T. During transcription, an mRNA molecule is formed. What would be the sequence of the anticodons on the tRNA molecules that bind to the first two codons of this mRNA?

Question 4

1 mark

Which term describes the physical expression of an organism's genetic makeup, such as having blue eyes or being tall?

Question 5

1 mark

A woman with blood group A (genotype \(I^A I^O\)) and a man with blood group B (genotype \(I^B I^O\)) have a child. The alleles for blood groups A and B are codominant. What is the probability that their child will have blood group AB?

Question 6

4 marks

Explain why the sex of a human offspring is determined by the sperm cell rather than the egg cell during fertilisation.

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Question 7

5 marks

Explain how environmental factors and ionising radiation can affect the incidence of mutations in an organism's genetic material.

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Question 8

3 marks

Using the terms genotype and phenotype, explain how a recessive allele can be present in an individual without being expressed.

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Question 9

5 marks

Cell division occurs by mitosis or meiosis.
a) Compare the daughter cells produced by mitosis with those produced by meiosis in terms of their genetic identity and chromosome number.
b) Explain the importance of meiosis in the process of sexual reproduction.

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Question 10

7 marks

The sequence of bases in a DNA molecule determines the sequence of amino acids in a protein.
a) Describe the process of transcription that occurs in the nucleus.
b) Explain how the mRNA molecule is used to produce a polypeptide chain during translation.

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