This question is about cell division - AQA - GCSE Biology Combined Science - Question 2 - 2022 - Paper 1
Question 2
This question is about cell division.
Write the biological structures from the box in the correct order of size.
cell
chromosome
gene
ucleus
Smallest
Largest
Fi... show full transcript
Worked Solution & Example Answer:This question is about cell division - AQA - GCSE Biology Combined Science - Question 2 - 2022 - Paper 1
Step 1
Write the biological structures from the box in the correct order of size.
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Answer
The correct order from smallest to largest is: gene, chromosome, nucleus, cell.
Step 2
Name Process A.
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Answer
Process A is differentiation.
Step 3
How many cell divisions are needed to form a 16-cell embryo from the original fertilised egg?
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Answer
To form a 16-cell embryo, 4 cell divisions are needed, as each division doubles the number of cells.
Step 4
How many chromosomes will there be in each of the embryo cells?
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Each of the embryo cells will have 46 chromosomes, as there are 23 pairs.
Step 5
Describe one change in the cell that occurs during each of the stages of the cell cycle.
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Stage 1: The cell grows and increases the number of organelles and sub-cellular structures.
Stage 2: Chromosomes duplicate, ensuring that each chromosome has an identical sister chromosome.
Stage 3: The nucleus divides, resulting in two identical cells through cytoplasmic division.
Step 6
Compare the growth of boys with the growth of girls.
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Boys generally grow taller than girls from birth, initially having slightly greater heights. As they grow older, boys continue to grow faster than girls between ages 11 and 14. By age 14, the height of girls and boys becomes more comparable, and after this age, girls start to grow at a more consistent rate while boys' growth slows down significantly.
Step 7
Give one way that cell division by mitosis is important in fully grown animals.
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Cell division by mitosis is important for the repair of tissues in fully grown animals.
