The diagram shows a cell - Edexcel - GCSE Biology - Question 4 - 2015 - Paper 1
Question 4
The diagram shows a cell.
(a) (i) Complete the sentence by putting a cross (✗) in the box next to your answer.
Structure P is the
A chloroplast
B gene
C cytopla... show full transcript
Worked Solution & Example Answer:The diagram shows a cell - Edexcel - GCSE Biology - Question 4 - 2015 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
Structure P is the
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Answer
The correct answer is D: nucleus. The nucleus is the organelle that contains the genetic material of the cell.
Step 2
Complete the sentence by putting a cross (✗) in the box next to your answer.
Structure Q is a
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Answer
The correct answer is A: chromosome. Chromosomes are structures within the nucleus that carry genetic information.
Step 3
State the genetic term used for an alternative form of the same gene.
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Answer
The genetic term for an alternative form of the same gene is 'allele.' Alleles can result in different traits being expressed.
Step 4
Complete the Punnett square to show the possible genotypes of the offspring of Paul and Sue.
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Answer
The completed Punnett square is:
| F | f |
-------------------
F | FF | Ff |
-------------------
f | Ff | ff |
Therefore, the possible genotypes of the offspring are: 25% FF, 50% Ff, and 25% ff.
Step 5
State the probability that Paul and Sue will have a child with cystic fibrosis.
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Answer
The probability that Paul and Sue will have a child with cystic fibrosis (genotype ff) is 25%, as shown in the Punnett square.
Step 6
Explain why a person can be underweight due to cystic fibrosis.
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Answer
Cystic fibrosis can lead to malabsorption of nutrients due to pancreatic insufficiency. This means that the digestive enzymes are not produced in sufficient quantities, making it difficult for the individual to absorb essential nutrients, ultimately resulting in a lower body weight.
