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The roles of genes in determining the phenotype

Biology5 questions

5 past-paper questions on The roles of genes in determining the phenotype

9700/42 · May/June 20255 marks
The development of awns is controlled by two genes: gene A/a and gene B/b. The genes are present on different autosomes. The…
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9700/42 · May/June 20254 marks
One of the changes that occurred during the domestication of wild rice to cultivated rice was the loss of the awns from rice…
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9700/42 · October/November 20243 marks
Leber Congenital Amaurosis (LCA) is an inherited eye disease. In LCA, the photoreceptor cells in the retina die at an early age.…
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9700/42 · October/November 20243 marks
Glycogen phosphorylase catalyses the conversion of glycogen to glucose in liver cells. The production of glycogen phosphorylase…
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9700/22 · May/June 20242 marks
Researchers have discovered that a gene mutation is not the cause of the two different forms of caldesmon. Explain what is meant…
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Question stems are shortened previews. Open a question to attempt the full version and have it marked.

Worked example

What a lost mark actually looks like

This answer reaches the right coordinates and still drops a mark — the conclusion is stated, but never justified. Examiners pay for the reasoning, not the answer.

MARKED

80%

Strong

M1dy/dx = 3x^2 - 12x + 9M1 earned
M1(x - 1) $(x - 3) = 0$ M1 earned
A1 $x = 1$ or $x = 3$ A1 earned
B1(1, 5) is a maximum and (3, 1) is a minimumB1 not earned

B1 — withheld
You stated the nature of each point correctly, but stated it without justification. This mark needs the reasoning shown — either evaluate the second derivative (d²y/dx² = 6x − 12, giving −6 at $x = 1$ and +6 at $x = 3$ ) or show a sign change of dy/dx either side of each point. An unsupported assertion earns nothing here even when the conclusion is right.

The roles of genes in determining the phenotype (9700) past-paper questions — marked instantly

These are real Cambridge Biology past-paper questions on The roles of genes in determining the phenotype. Open one, attempt it, then upload your working — MarkScheme grades it against the official 9700 mark scheme so you see exactly where the marks are won and lost on this topic.

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Frequently asked questions

How many The roles of genes in determining the phenotype questions are there for 9700?: This page collects 5 recent Cambridge Biology (9700) past-paper questions tagged to The roles of genes in determining the phenotype. Each links straight to instant marking against the official 9700 scheme.
How are The roles of genes in determining the phenotype answers marked?: Type or photograph your working and MarkScheme scores it against the real 9700 mark scheme for this topic — method, accuracy and any band descriptors — so you see exactly where the marks are.
Where can I learn The roles of genes in determining the phenotype first?: Start with the free Biology lesson on The roles of genes in determining the phenotype, then come back and drill past-paper questions under timed conditions.