Question

Which one or more of the following genes/markers is/are typically used for species identification?

• A. 16S rRNA
• B. Cytochrome Oxidase I
• C. IgG
• D. Microsatellites

Answer 1

The Correct Option is A, B

Species identification is commonly performed using molecular markers that help in distinguishing between different species. The following markers are typically used:

A. 16S rRNA:

The 16S ribosomal RNA gene is a highly conserved gene found in the ribosome of bacteria. It is widely used in bacterial species identification because of its variation between species and conserved regions that make it a good candidate for PCR amplification and sequencing. This marker is especially useful for identifying bacterial species.

B. Cytochrome Oxidase I (COI):

Cytochrome Oxidase I is a mitochondrial gene that is commonly used for species identification in animals, particularly in invertebrates and vertebrates. This gene has a higher rate of mutation compared to other genes, making it useful for differentiating species within a genus or family. The COI gene is commonly used in DNA barcoding.

C. IgG:

IgG is an antibody found in the immune system of vertebrates. It is not typically used for species identification. IgG levels may vary between individuals or species but are not a reliable molecular marker for species-level differentiation.

D. Microsatellites:

Microsatellites are short, repetitive DNA sequences that are used in genetic studies, including population genetics and biodiversity studies. While they can provide information about genetic diversity and relatedness, they are not typically used for initial species identification but may be used to study genetic variation within species.

Conclusion:

The most commonly used markers for species identification in this case are 16S rRNA (A) and Cytochrome Oxidase I (B), making the correct answer A, B.