Homologous genes

Question

Homologous genes

BlackTom AI · Accepted Answer

Homologous genes are genes that descended from a common ancestral gene, so they generally retain sequence similarity and often related functions.

1) Relevant knowledge points and concepts
- Homology: shared ancestry between genes. Homologs include orthologs (diverged by speciation) and paralogs (diverged by duplication).
- Sequence similarity: because homologs descend from the same ancestral DNA, their nucleotide (and amino acid) sequences tend to be similar, especially in conserved regions.
- Functional conservation: homologous genes often perform the same or related biochemical or physiological roles, though function can diverge after duplication or over long evolutionary time.

2) Step-by-step reasoning
- Option (a) states homologs are derived from the same ancestral gene. By definition of homology, this is true: homology is about descent from a common ancestor.
- Option (c) claims homologs have similar DNA sequences. Since they share ancestry, mutation accumulates from a common starting sequence, so detectable sequence similarity (particularly in conserved motifs/domains) is expected; sequence comparison is a primary method to identify homologs.
- Option (b) asserts homologs are likely to carry out the same or similar functions. Because structure and sequence constrain function, many homologs retain similar biochemical activities or roles in pathways (especially orthologs), although some paralogs can acquire novel functions.
- Therefore, each of (a), (b), and (c) correctly describes an aspect of homologous genes.

3) Calculations/intermediate steps
- Not applicable (no numeric calculation required).

4) Why the correct answer is correct
- The three individual statements together capture the main properties of homologous genes: common ancestry, sequence similarity, and likely functional similarity. Thus the comprehensive choice that includes all three is correct.

5) Why the other options are not the best choice
- Options (a), (b), and (c) are each true but incomplete descriptions. Choosing any single one omits additional key aspects of homology.

Conclusion: The best answer is d) exhibit all of the above., which matches the provided correct answer.

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