Sequence of which of the following is used to know the phylogeny ?

Options

A. mRNA
B. rRNA
C. tRNA
D. DNA

Explanation

To determine the phylogeny of organisms, we follow these steps:

1. **Understand Phylogeny**: Phylogeny is the study of the evolutionary relationships among different groups of organisms. It helps us understand how species are related to one another and their evolutionary history.

2. **Identify the Importance of Sequences**: In phylogenetic studies, specific sequences of nucleic acids (like DNA or RNA) are analyzed to determine these relationships. The sequences can provide insights into the evolutionary lineage of organisms.

3. **Focus on rRNA**: Among the various sequences that can be used, ribosomal RNA (rRNA) is particularly significant. rRNA is a component of the ribosome, which is essential for protein synthesis in all living cells.

4. **Specify the Type of rRNA**: The 16s rRNA is specifically highlighted in phylogenetic studies. This is because the 16s rRNA gene is highly conserved across different species, meaning that it has remained relatively unchanged throughout evolution. This conservation makes it an excellent marker for studying evolutionary relationships.

5. **Conclusion**: Therefore, the sequence used to know the phylogeny is the 16s rRNA.