Question

The pattern of DNA fragments resulting from restriction enzyme digestion of genomic DNA from two species of skunk with EcoRI show extensive similarities. Which of the following is depicted by this statement?

• A. The two skunks must be the same species, not different species.
• B. Most of the restrictions sites recognized by EcoRI are found at approximately the same distances apart in the DNA from both skunk species.
• C. Restriction enzyme digestion with EcoRI produces the same pattern of DNA fragments in all organisms.
• D. Restriction enzyme digestion with EcoRI produces the same pattern of DNA fragments in all species of skunks.
• E. The genetic makeup of the two skunk species is identical.

Answer 1

Answer: (B)

Most of the restrictions sites recognized by EcoRI are found at approximately the same distances apart in the DNA from both skunk species.

The organisms which are closely related to each other have similar geentic constiution. The skunks may have similarities in the gene arrangement and the presence of the restriction sites. Extensive similarities between DNA profiles of two species refers to the presence of restriction sites at almost same distance in both species. Same genetic makeup or DNA profiles of same species will give identical restriction fragments.

Thus, the correct answer is option B.