Learners conducted an investigation to determine which blood group was the most common in their community - NSC Life Sciences - Question 3 - 2023 - Paper 2
Question 3
Learners conducted an investigation to determine which blood group was the most common in their community.
They collected information about the blood groups of 200 ... show full transcript
Worked Solution & Example Answer:Learners conducted an investigation to determine which blood group was the most common in their community - NSC Life Sciences - Question 3 - 2023 - Paper 2
Step 1
State the aim of the investigation.
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To determine which blood group was the most common in their community.
Step 2
State THREE planning steps to consider when conducting this investigation.
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Obtain permission from the school/clinic to conduct the investigation.
Decide on the sample size required for accurate results.
Decide on the method for recording results from the clinics.
Step 3
Give ONE reason why they did not include first-time donors.
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First-time donors' blood groups are not known yet, hence they cannot be included in the database.
Step 4
Calculate the number of participants that had blood group B. Show ALL workings.
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To find the number of participants with blood group B, we note that 15% of 200 donors had this blood type. Thus, the calculation is as follows:
Number of participants with blood group B = 15/100 x 200 = 30 participants.
Step 5
Name the blood group which has only recessive alleles in the genotype.
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Blood group O.
Step 6
Name the blood group which is a result of co-dominance.
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Blood group AB.
Step 7
Give ALL the possible genotypes of the blood group represented by 25% of the donors.
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For blood group A (25% of the donors), the possible genotypes are:
