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Describe three differences between the processes of mitosis and meiosis - AQA - GCSE Biology - Question 5 - 2020 - Paper 1
Question 5
Describe three differences between the processes of mitosis and meiosis. 1. Mitosis produces two (daughter) cells whereas meiosis produces four (daughter) cells. 2... show full transcript
Worked Solution & Example Answer:Describe three differences between the processes of mitosis and meiosis - AQA - GCSE Biology - Question 5 - 2020 - Paper 1
Step 1
Describe three differences between the processes of mitosis and meiosis.
Answer
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Mitosis produces two (daughter) cells, whereas meiosis produces four (daughter) cells.
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Mitosis involves one cell division, while meiosis involves two cell divisions.
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Mitosis produces genetically identical cells, but meiosis produces genetically different cells.
Step 2
Step 3
Step 4
What is the probability of the child having Dupuytren’s?
Answer
To find the probability of their child having Dupuytren’s, we can set up a Punnett square:
- The genotype of person 7 (male) is Dd.
- The genotype of person 8 (female) is dd.
The possible gametes are:
- Person 7 can produce gametes: D or d
- Person 8 can produce gametes: d or d
The Punnett square is as follows:
| d | d | |
|---|---|---|
| D | Dd | Dd |
| d | dd | dd |
From this square, we can see the offspring probabilities:
- 50% Dd (having Dupuytren’s)
- 50% dd (not having Dupuytren’s)
Therefore, the probability that their child will have Dupuytren’s is 50%.
Step 5
Explain how Figure 6 shows the allele for Dupuytren’s is not on the Y chromosome.
Answer
Figure 6 shows that both males and females in the family can have Dupuytren’s, indicating the trait is autosomal. Since only males have Y chromosomes and they do not pass this Y chromosome to daughters, the presence of the trait in females demonstrates that the allele causing Dupuytren’s cannot be located on the Y chromosome.