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
Figure 3 shows how a ... 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 of size for the biological structures is:
gene < chromosome < nucleus < cell
Step 2
Name Process A.
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Answer
Process A is known as 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, there are 4 cell divisions necessary.
Step 4
How many chromosomes will there be in each of the embryo's cells?
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Each embryo cell will have 46 chromosomes (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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Answer
Stage 1: The cell undergoes growth and increases the number of organelles.
Stage 2: Chromosome replication occurs, where the chromosomes are duplicated.
Stage 3: The cell undergoes cytokinesis, resulting in two identical daughter cells.
Step 6
Compare the growth of boys with the growth of girls.
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From birth to around age 10, boys and girls show similar heights. However, from age 11 to 14, boys tend to grow taller at a quicker rate compared to girls. After age 14, girls stop growing earlier, while boys continue to grow until about 18. Overall, boys generally remain taller throughout childhood and adolescence.
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 essential for the repair of tissues in fully grown animals.
