Evolution Test

What do fossils indicate about past life forms?

Fossils provide evidence of past life forms, showing changes over time and helping us trace the evolution of species.

What is the fossil record?

It demonstrates transitions between species and provides a timeline of evolutionary history.

What is natural selection?

A process where organisms better adapted to their environment survive and reproduce, passing on favorable traits.

What is artificial selection?

Human-driven breeding for specific traits, such as in crops or domesticated animals.

What are adaptations?

Traits that increase an organism's ability to survive and reproduce in a specific environment.

What is a key example of adaptation?

Camouflage in animals and drought-resistant plants.

How does biogeography support evolution?

The distribution of species across different geographical areas reveals patterns that support common ancestry and adaptive evolution.

What are homologous structures?

Structures that indicate common ancestry; similar structures adapted for different functions.

What are analogous structures?

Structures that show similar functions but do not share a common ancestry.

What are vestigial structures?

Remnants of structures that had a function in ancestors; their presence supports evolutionary history.

What causes traits to change over time?

Natural selection, mutations, genetic drift, and gene flow.

What is fitness in the context of evolution?

An organism's ability to survive and reproduce; greater fitness increases the frequency of advantageous traits.

Why is genetic variation important for evolution?

It provides the raw material for evolution, allowing some individuals to adapt better to environmental changes.

What shared traits indicate common ancestry?

Homologous structures, embryological similarities, and genetic evidence.

What does evidence of whale evolution suggest?

Whales evolved from land mammals, with fossil evidence and molecular biology showing intermediate forms like Ambulocetus.

What influenced the beak shape changes in Darwin's finches?

Variations in food sources led to natural selection favoring different beak shapes.

What is speciation?

The formation of new species through evolutionary processes.

What causes allopatric speciation?

Geographical barriers like mountains and rivers.

What occurs in sympatric speciation?

Speciation without physical barriers, often through ecological or behavioral isolation.

What are prezygotic barriers?

Factors that prevent mating or fertilization, such as behavioral or mechanical isolation.

What are postzygotic barriers?

Factors that prevent viable or fertile offspring, such as hybrid inviability or infertility.

What is gene duplication?

The creation of genetic material for potential new functions, driving evolutionary innovation.

What is a selective pressure?

Environmental factors that favor certain traits, leading to adaptations.

How do bacteria or insects develop resistance?

Through mutations and natural selection leading to resistance against antibiotics or pesticides.

What does biochemical evidence support in evolution?

Similarities in DNA, RNA, and proteins across species indicate shared ancestry.

What happens to favorable traits over time?

They become more common due to higher survival and reproduction rates.

What is the definition of variation in a population?

Differences among individuals that are crucial for natural selection.

What are key factors required for speciation?

Reproductive isolation, genetic divergence, and selective pressures.