The diagram shows a cell - Edexcel - GCSE Biology - Question 4 - 2015 - Paper 1
Question 4
The diagram shows a cell.
**Complete the sentence by putting a cross (✗) in the box next to your answer.**
Structure P is the
A chloroplast
B gene
C cyto... 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
Structure P is the D nucleus. The nucleus contains the genetic material of the cell and directs cellular activities.
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
Structure Q is an A chromosome. Chromosomes are structures within the nucleus that house genes.
Step 3
State the genetic term used for an alternative form of the same gene.
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Answer
The genetic term used for an alternative form of the same gene is 'allele'.
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 as follows:
| F | f
--------------
F | FF | Ff
--------------
f | Ff | 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 is 25%, as there is one 'ff' out of four possible genotypes.
Step 6
Explain why a person can be underweight due to cystic fibrosis.
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A person can be underweight due to cystic fibrosis because the condition affects the lungs and digestive system. It causes thick mucus that can block the pancreas, preventing the proper absorption of nutrients, which leads to malnutrition and weight loss.
