Sample exam questions - inheritance, variation and evolution - AQAThree or four mark questions

Egg cells and sperm cells each contain the structures given in the box.

List these three structures in size order, starting with the smallest. [2 marks]

1. __________ (smallest)
2. __________
3. __________ (largest)

Tip - Use the three words provided within the question.

Sometimes babies are born with extra fingers or toes. This condition is called polydactyly.

The diagram shows inheritance of polydactyly in a family.

Polydactyly is caused by a dominant allele, D.

The recessive allele of the gene is represented by d.

Use one genetic diagram to show the inheritance of the polydactyly gene by R and S. [4 marks]

Tip - use the family tree, it is there to help you. Read the key, work out who is affected and unaffected. Who are the people they are referring to in the question?

Darwin suggested the theory of natural selection.

Explain how natural selection occurs. [3 marks]

Tip - identify at least three different points.