Gene A exists in five forms in the human population. Each form, or allele, has a different number of tandem repeats. The alleles are amplified with PCR and then run on a polyacrylamide gel for analysis, yielding the following banding pattern. Which of the lanes in the gel above could represent the alleles found in one individual?
A)All 5 lanes are possible.
B)Lanes 2, 4, and 5 are possible.
C)Lanes 2, 3, 4, and 5 are possible.
D)Lanes 1, 2, 3, and 4 are possible.

Question

Gene A exists in five forms in the human population. Each form, or allele, has a different number of tandem repeats. The alleles are amplified with PCR and then run on a polyacrylamide gel for analysis, yielding the following banding pattern.  Which of the lanes in the gel above could represent the alleles found in one individual?
A)All 5 lanes are possible. 
B)Lanes 2, 4, and 5 are possible. 
C)Lanes 2, 3, 4, and 5 are possible. 
D)Lanes 1, 2, 3, and 4 are possible.

Quizplus · Accepted Answer

Based on the banding pattern provided, only lanes 2, 4, and 5 have visible bands. This suggests that the individual in question may have alleles that correspond to these bands. Lane 1 does not have any visible bands, while lane 3 has a band that is significantly different from the ones in lanes 2, 4, and 5. Therefore, the correct answer is B.

Gene a Exists in Five Forms in the Human Population