Gradual Transition
Understand gradual transition in evolution: species change through many small incremental steps over vast time periods, with no sudden jumps between radically different forms.
Key Concepts
The transition from a land dwelling ancestor to a modern whale took about 10 million years. It wasn't a sudden jump.
The fossil record shows the intermediate steps:.
Common Questions
What does gradual transition mean in evolutionary biology?
Gradual transition means species evolve through many small changes over long periods rather than sudden leaps. Each generation shows slight differences from the last, accumulating into major changes over millions of years.
How is gradual transition supported by fossil evidence?
The fossil record shows a progression of intermediate forms between ancestral and modern species. The step-by-step changes visible in fossils support the idea that evolution proceeds gradually.
Why can't evolution produce entirely new body plans in one generation?
Evolution works through inherited genetic changes in populations. Each change must be viable in the current environment, so radical shifts happen only as many small changes accumulate across thousands of generations.