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The diagram shows a section of a chromosome in an insect - HSC - SSCE Biology - Question 9 - 2020 - Paper 1
Question 9
The diagram shows a section of a chromosome in an insect. It represents three genes amongst non-coding DNA. The crosses mark locations of four separate mutations. G... show full transcript
Worked Solution & Example Answer:The diagram shows a section of a chromosome in an insect - HSC - SSCE Biology - Question 9 - 2020 - Paper 1
Step 1
Which location could produce a new allele for eye colour?
Answer
To determine the location that could produce a new allele for eye colour, it's essential to evaluate the position of the genes represented in the diagram.
In this case, Gene 2, which is responsible for eye colour, is situated between the markers Q and R. Mutations occurring at these positions can lead to new alleles for that specific gene.
- A. P: This location corresponds to Gene 1 (body colour), which does not influence eye colour.
- B. Q: This location is at the beginning of Gene 2 (eye colour) and could potentially introduce a change, but it's less likely to create a completely new allele compared to the inner position.
- C. R: This location is also within Gene 2 and is the most probable site for a mutation to create a new allele for eye colour, as it directly affects the gene associated with that trait.
- D. S: This location corresponds to Gene 3 (wing shape), and hence would not impact eye colour.
Thus, the location that could produce a new allele for eye colour is C. R.