Eye colour is controlled by genes - Edexcel - GCSE Biology Combined Science - Question 1 - 2016 - Paper 1
Question 1
Eye colour is controlled by genes.
The allele for brown eyes, B, is dominant to the allele for blue eyes, b.
(a) A female with blue eyes and a male with brown eyes a... show full transcript
Worked Solution & Example Answer:Eye colour is controlled by genes - Edexcel - GCSE Biology Combined Science - Question 1 - 2016 - Paper 1
Step 1
Complete the Punnett square to determine the phenotype of the child.
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Answer
To complete the Punnett square using the given alleles, we have:
| B | B |
-----------------
b | Bb | Bb |
-----------------
b | Bb | Bb |
The possible genotypes of the child are Bb, indicating that the child would have brown eyes since the allele for brown eyes (B) is dominant.
Step 2
Complete the tally chart, in Figure 2, for this data.
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Answer
To complete the tally chart for the eye colours recorded:
eye colour
tally
total
blue
brown
green
hazel
Step 3
Give another appropriate method of displaying this information.
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Answer
Another appropriate method to display eye colour data could be using a pie chart, which visually represents the proportions of each eye colour across the population surveyed.
Step 4
Which sequence is the complementary DNA strand?
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Answer
The complementary DNA strand for the given sequence ATGGC TAAGTA is ACGCCTAAGTA (option B).
