A group of six students has taken samples of their own cheek cells,purified the DNA,and used a restriction enzyme known to cut at zero,one,or two sites in a particular gene of interest.
Analysis of the data obtained shows that two students each have two fragments,two students each have three fragments,and two students each have one only.What does this demonstrate?
A)Each pair of students has a different gene for this function.
B)The two students who have two fragments have one restriction site in this region.
C)The two students who have two fragments have two restriction sites within this gene.
D)Each of these students is heterozygous for this gene.

Question

Quizplus · Accepted Answer

The presence of different numbers of fragments among the students indicates variation in the number of restriction sites within the gene of interest. Specifically, the two students with two fragments indicate the presence of one restriction site, as the enzyme cuts the DNA once, resulting in two pieces.

A Group of Six Students Has Taken Samples of Their