What fraction of the cells in Figure 1 is dividing by mitosis?
Tick (✓) one box - AQA - GCSE Biology - Question 2 - 2010 - Paper 1
Question 2
What fraction of the cells in Figure 1 is dividing by mitosis?
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1/4
1/2
3/4
Worked Solution & Example Answer:What fraction of the cells in Figure 1 is dividing by mitosis?
Tick (✓) one box - AQA - GCSE Biology - Question 2 - 2010 - Paper 1
Step 1
What fraction of the cells in Figure 1 is dividing by mitosis?
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Answer
The fraction of the cells dividing by mitosis in Figure 1 is 1/4.
Step 2
The cells which are not dividing in Figure 1 each contain 10 chromosomes.
One of these cells divides by mitosis to produce two new cells.
How many chromosomes will each new cell contain after mitosis?
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Answer
Each new cell will contain 10 chromosomes after mitosis.
Step 3
Cells divide in a series of stages called the cell cycle.
Complete the sentences.
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Answer
Before mitosis occurs, the cell grows.
The genetic material in the cell doubles when DNA replicates.
After the chromosomes have been pulled to each end of the cell, the cytoplasm divides.
Step 4
Which stage of the cell cycle takes the most time?
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Answer
Stage C takes the most time.
Step 5
What percentage of time in the cell cycle is stage A?
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Answer
Stage A comprises 10% of the cell cycle.
Step 6
Which organ system contains heart cells?
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Answer
The organ system that contains heart cells is the circulatory system.
Step 7
Name one medical condition that could be treated using heart cells created from an embryo.
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Answer
One medical condition that could be treated is cardiovascular disease (CVD).
Step 8
Give one reason why a patient may not want to be treated with heart cells created from an embryo.
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One reason is that it may be considered unethical.
