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The graph shows the variation in eye colour in a human population - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Question 3
The graph shows the variation in eye colour in a human population. How many individuals had their eye colour recorded in this human population? Put a cross (%) in ... show full transcript
Worked Solution & Example Answer:The graph shows the variation in eye colour in a human population - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Step 1
Step 2
Calculate the percentage of individuals with brown eyes in this human population.
Answer
To calculate the percentage of individuals with brown eyes, we take the number of individuals with brown eyes (27) and divide it by the total number of individuals recorded. The total can be found by summing all the individuals across the eye colours:
Total individuals = 7 (blue) + 27 (brown) + 5 (green) + 3 (grey) + 2 (hazel) = 44.
Now, the percentage is calculated as follows:
ext{Percentage} = rac{ ext{Number of brown-eyed individuals}}{ ext{Total number of individuals}} imes 100
Substituting in the values:
ext{Percentage} = rac{27}{44} imes 100 \\ ext{Percentage} \\ ext{≈ 61.36 ext{ extperthousand} ext{or approximately 61.4 ext{ extperthousand} ext{ rounded to one decimal place.}}