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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The aim of the investigation is to determine which blood group is the most common among the donors in the selected community.
Step 2
State THREE planning steps to consider when conducting this investigation.
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Obtain permission from the relevant authorities (school/clinic) to conduct the investigation.
Decide on the sample size, ensuring it is representative of the community.
Determine the method for recording and analyzing the blood group data.
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 and not included in the existing database, which may lead to incomplete data.
Step 4
Calculate the number of participants that had blood group B. Show ALL workings.
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The percentage of blood group B is 25% of the total 200 donors surveyed.
Calculating the number of participants:
Number of blood group B participants = 25% of 200 = 0.25 × 200 = 50 participants.
Step 5
Name the blood group which has only recessive alleles in the genotype.
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Blood group O has only recessive alleles in the genotype.
Step 6
Name the blood group which is a result of co-dominance.
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Blood group AB is a result of co-dominance.
Step 7
Give ALL the possible genotypes of the blood group represented by 25% of the donors.
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The possible genotypes represented by 25% of the donors (blood group B) are:
