Sickle cell anaemia is an inherited human disease - Junior Cycle Science - Question 5 - 2019
Question 5
Sickle cell anaemia is an inherited human disease. It causes the body to produce red blood cells that have an irregular shape. The gene for the disease is passed on ... show full transcript
Worked Solution & Example Answer:Sickle cell anaemia is an inherited human disease - Junior Cycle Science - Question 5 - 2019
Step 1
Square 1 and circle 2 are a married couple. How many children did this couple have?
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Answer
The couple (square 1 and circle 2) have three children, as indicated by the three branches leading from them in the family tree.
Step 2
What evidence is there from the diagram that persons 6 and 7 are both carriers?
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Answer
The evidence that persons 6 and 7 are carriers is indicated by the fact that their child (person 10) suffers from sickle cell anaemia. As a result, both parents must carry at least one copy of the sickle cell gene.
Step 3
Classify the characteristics below as being either genetically controlled or not genetically controlled by placing a tick (✓) in the correct column in each case.
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Characteristic Genetically controlled Not genetically controlled
Eye colour ✓
How to cycle a bike ✓
Step 4
The function of red blood cells is to
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Answer
✓ Carry oxygen
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