Question

Given below are two statements: Statement I: Orthologs are sequences from different organisms or genomes derived from speciation events, while paralogs are sequences derived from gene duplication events rather than speciation events. Statement II: Both orthologs and paralogs are homologous sequences. In the light of the above statements, choose the correct answer from the options given below:

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is correct but Statement II is false
• D. Statement I is incorrect but Statement II is true

Hint:

• Orthologs → Speciation
• Paralogs → Gene duplication
• Both → Homologs

Answer 1

The Correct Option is A

Concept: In molecular biology, homologous genes are classified based on their evolutionary origin:
• Orthologs: Genes in different species that evolved from a common ancestral gene through speciation.
• Paralogs: Genes related by duplication within a genome.
• Both are types of homologous sequences.

Step 1: Evaluating Statement I.
Statement I correctly defines:
• Orthologs → Derived from speciation events
• Paralogs → Derived from gene duplication events Hence, Statement I is correct.

Step 2: Evaluating Statement II.
Both orthologs and paralogs share a common evolutionary origin, so they are classified as homologous sequences. Hence, Statement II is also correct.

Step 3: Selecting the correct option.
Since both statements are true, the correct answer is (A).