Question

Below are the partial sequences of the same area of human chromosome 1. This area corresponds to the XMP1 gene. How many alleles of this gene are present in the samples below?

Sample 1: …ATCGA…

Sample 2: …TTCGA…

Sample 3: …ATCGA…

Sample 4: …GGCGG…

Sample 5: …GGCGG…

2

4

1

There is not enough information to answer this question.

3

5

Answer 1

The answer is 3
alleles are a variation of the same sequence
so count how many variations are there or how many that are different from each other!