How can evolutionary processes that we measure today inform interpretations of evolutionary changes seen in the fossil record?

How can evolutionary processes that we measure today inform interpretations of evolutionary changes seen in the fossil record?

• A. Fossils cannot reveal any genetic mechanisms
• B. Modern evolutionary processes cannot illuminate fossil changes
• C. Fossils show morphology but never permit inferences about genetics
• D. If the same morphological changes occur in fossils and living populations, the genetic mechanisms identified in living populations may explain the fossil changes

Answer: (D)

The main idea is that current evolutionary processes provide a bridge to understanding the past. When a similar morphological change is seen in fossils and in living populations, the genetic mechanisms we’ve identified in modern organisms can plausibly explain the fossil change. Fossils reveal form and function, and by comparing those forms to what we know about the genetics of present-day populations, we can infer which genes or developmental pathways were likely involved in producing the ancient trait. This approach does not claim that fossils reveal genetics directly, but it uses contemporary genetic knowledge to interpret historical patterns. That’s why this option best fits: if the same kinds of morphological shifts occur in both fossils and living populations, the genetic explanations we’ve uncovered today may account for the changes seen in the fossil record.

The main idea is that current evolutionary processes provide a bridge to understanding the past. When a similar morphological change is seen in fossils and in living populations, the genetic mechanisms we’ve identified in modern organisms can plausibly explain the fossil change. Fossils reveal form and function, and by comparing those forms to what we know about the genetics of present-day populations, we can infer which genes or developmental pathways were likely involved in producing the ancient trait. This approach does not claim that fossils reveal genetics directly, but it uses contemporary genetic knowledge to interpret historical patterns.

That’s why this option best fits: if the same kinds of morphological shifts occur in both fossils and living populations, the genetic explanations we’ve uncovered today may account for the changes seen in the fossil record.