Evidence for evolution

What is evolution?

Evolution occurs when heritable characteristics of a species change over time.

What is the heart of scientific understanding of the natural world?

Evolution.

What distinguishes heritable characteristics from acquired characteristics?

Heritable characteristics are passed from parent to offspring, while acquired characteristics develop during an individual's lifetime.

What mechanism is understood to drive evolution?

Natural selection.

What evidence supports the theory of evolution?

Evidence from fossils, selective breeding, and homologous structures.

What does the fossil record provide evidence for?

The evolution of species over time.

What did the sequence of rock layers reveal about fossils?

The sequence of fossils matches the expected order of evolution.

What kind of organisms appeared first in the fossil record?

Bacteria and simple algae.

What is palaeontology?

The branch of science that studies fossils.

Why are fossil sequences important?

They link existing organisms with their likely ancestors.

What is artificial selection?

The process by which humans breed certain traits in domesticated animals.

What does the comparison of modern livestock with wild species show?

There can be significant differences due to artificial selection.

What example illustrates the effect of artificial selection in dogs?

Many breeds of dog have been developed from domesticated wolves.

What are missing links in evolution?

Gaps in the fossil record showing a lack of evidence connecting species.

What is one objection to fossil evidence for evolution?

Missing links like that between reptiles and birds.

What is the significance of the Dilong paradoxus fossil?

It provides insights into the evolution of dinosaurs and birds.

What is an example of evidence for selection in the domestication of corn?

The increase in yield from teosinte to modern corn varieties.

What do homologous structures suggest about species?

That they may have a common ancestor despite different functions.

What are vestigial organs?

Reduced structures that serve no function, such as the appendix in humans.

What is convergent evolution?

When different species develop similar structures due to similar functions.

What is the pentadactyl limb?

A limb structure with five digits, common in mammals, birds, amphibians, and reptiles.

What does speciation refer to?

The process by which populations evolve to become separate species.

How can populations diverge into separate species?

By becoming separated and undergoing different natural selections.

What is adaptive radiation?

The process where organisms diversify rapidly from an ancestral species into a variety of forms.

What is continuous variation?

Gradual differences across geographical ranges of related populations.

What famous example did Darwin use to illustrate variation among species?

The birds from the Galápagos Archipelago.

What is industrial melanism?

The phenomenon where darker individuals become more common in polluted areas due to better camouflage.

How does Biston betularia exemplify natural selection?

The melanistic variety became common in polluted areas where it had better camouflage.

What is one criticism of the early experiments on natural selection?

The design of camouflage and predation experiments was criticized.

What is one conclusion from Michael Majerus's findings on melanism?

The evidence for pollution causing melanism in Biston betularia is strong.

What role do geological eras play in understanding evolution?

They help categorize the different time periods during which species evolved.

Why is the study of fossils important?

It provides a timeline and context for understanding evolutionary change.

What is a potential outcome if two separated populations of a species meet again?

They may not interbreed if they have diverged enough to become separate species.

What types of variations are observed in domesticated animals?

Significant variations in traits due to artificial selection.

What are some features of the pentadactyl limb?

Common bone structure despite different uses among vertebrates.

What does the presence of rudimentary organs suggest about evolution?

They indicate that certain structures have been retained even if they no longer serve a function.

What is the role of natural selection in evolution?

It determines which traits become more or less common in a population.

What is a notable example of a transitional fossil?

Dilong paradoxus, which shows features of both dinosaurs and birds.

What does the discovery of transitional fossils suggest?

They provide evidence for the gradual evolution of species.

What do the lengths of corn cobs indicate about domestication?

Corn has been selectively bred for greater size and yield over time.

What is meant by 'unity of type' in evolutionary biology?

Different species sharing a common structural framework due to shared ancestry.

What does the study of vertebrate limbs reveal about evolution?

It shows how different functions can arise from a common structural plan.

How is natural selection tested in a scientific context?

Through observation, experimentation, and computer modeling.

What are some examples of homologous structures in vertebrates?

The forelimbs of humans, horses, and bats.

What does biogeography reveal about evolution?

It shows how species have adapted to diverse environments.

What impacts can rapid environmental changes have on species?

They can drive the natural selection of certain traits over others.

What is the relevance of the Galápagos Islands to the study of evolution?

They provided key insights into natural selection and speciation.