Question 2(e)
[Maximum number: 4]
Red blood cells contain the protein haemoglobin.
Mutations are always inherited in single-celled organisms that reproduce asexually but are not always inherited in organisms that reproduce sexually.
Explain why.
IGCSE Biology Extended 17.1.9—Most body cells in an organism contain Topic Practice
17.1.9—Most body cells in an organism contain
• Explain that most body cells in an organism contain the same genes, but many genes in a particular cell are not expressed because the cell only makes the specific proteins it needs
Question 5(b)
[Maximum number: 2]
Explain why body cells can have different specialised functions even though they contain the same genes.
Question 6(d)
[Maximum number: 3]
Fig. 6.1 shows some cells from the shoot tip of an onion, Allium cepa.
Fig. 6.1
Some cells in shoot tips become leaf cells and others become cells in the stem or in flowers. Explain why it is important that only some of the genes in cell A are expressed in these cells.