ExpertEasy1 markMultiple Choice
AQA GCSE · Question 02.1 · Cell Biology
The diagram shows some animal cells. Some of the cells are dividing by mitosis for growth and repair.
What fraction of the cells in the diagram is dividing by mitosis?
The diagram shows some animal cells. Some of the cells are dividing by mitosis for growth and repair.
What fraction of the cells in the diagram is dividing by mitosis?
Answer options:
A.
1/8
B.
1/4
C.
1/2
D.
3/4
How to approach this question
1. Count the total number of cells shown in the diagram.
2. Identify and count the cells that are in the process of mitosis (these will look different, often with visible chromosomes lined up or being pulled apart).
3. Write the number of dividing cells as the numerator (top number) and the total number of cells as the denominator (bottom number) of a fraction.
4. Simplify the fraction if possible.
Full Answer
B.1/4✓ Correct
1/4
In the provided diagram, there are a total of 8 cells. By observing them, we can see that 6 cells are in their normal state (interphase), with a distinct nucleus. However, 2 cells show condensed chromosomes, which is a clear sign of mitosis (cell division).
Therefore, the fraction of cells dividing is 2 (dividing cells) out of 8 (total cells).
Fraction = 2/8
This fraction can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 2.
2 ÷ 2 = 1
8 ÷ 2 = 4
So, the simplified fraction is 1/4.
Common mistakes
✗ Miscounting the total number of cells.\n✗ Miscounting the number of dividing cells.\n✗ Not simplifying the fraction 2/8.
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