Biology: Evolution, Natural Selection, and Biodiversity Listen as a podcast Add to calendar Study with friends

What is the concept of 'descent with modification'?

It refers to the idea that current species are descendants of ancestral species, evolving over time.

What is biogeography?

The geographic distribution of species, which provides evidence for evolution.

What was Pangaea?

A single large continent that existed before Earth's continents separated due to continental drift.

What are endemic species?

Species that are not found anywhere else in the world, often found on islands.

What does it mean when there are many endemic Species on a nearby island?

That they are related to species on the nearest mainland or island

What did Darwin observe about species on islands?

He noted that species on islands often gave rise to new species as they adapted to new environments.

What are the three key observations about life illustrated by Lepidopterans?

The fit between organisms and their environment, the shared characteristics of life, and the diversity of life.

What major work did Charles Darwin publish in 1859?

The Origin of Species.

What did Darwin phrase Evolution by?

Descent with modification

In what way can evolution be viewed as?

a pattern and a process

Who was the founder of taxonomy?

Carolus Linnaeus.

What is the binomial format for naming species?

A two-part name consisting of the genus and species (e.g., Homo sapiens).

What is paleontology?

The study of fossils, which helped lay the groundwork for Darwin's ideas.

Who developed the study of paleontology?

French scientist Georges Cuvier

What is Strata?

Layers of rock or sedimentary rock where fossils or traces of organisms remain

Who developed the idea that changes in Earth's surface can result from slow, continuous actions?

Geologists James Hutton and Charles Lyell.

What was Lamarck's hypothesis of evolution?

He proposed that species evolve through use and disuse of body parts and the inheritance of acquired characteristics.

What did Darwin observe during his travels in South America?

He collected specimens and noted that fossils resembled living species from the same region.

How did Darwin's visit to the Galápagos Islands influence his thinking?

It led him to hypothesize that species from South America had colonized the islands and speciated there.

What did Darwin conclude about the age of the Earth?

He believed it was much older than 6,000 years, influenced by Lyell's work.

What did the Greek philosopher Aristotle contribute to the classification of species?

He viewed species as fixed and arranged them on a scala naturae.

What does the term 'scala naturae' refer to?

A hierarchical structure of life proposed by Aristotle, where species were seen as fixed.

What did Cuvier speculate about the boundaries between strata in rock layers?

He suggested they represent catastrophes that destroyed many species.

What are the two main aspects of evolution according to Darwin?

Evolution is both a pattern (the diversity of life) and a process (descent with modification).

What role did the study of fossils play in Darwin's theory?

Fossils provided evidence for the change in species over time and the concept of common descent.

What is the relationship between the Galápagos Islands and mainland species?

Species on the islands are often closely related to species on the nearest mainland.

What did Darwin's findings in the Galápagos Islands contribute to?

They contributed to his theory of natural selection and the understanding of species adaptation.

What is the primary mechanism of evolution proposed by Darwin?

Natural selection

What does natural selection favor in individuals?

Individuals with favorable inherited traits

What year did Darwin write an essay on natural selection?

1844

Who sent Darwin a manuscript that prompted him to publish 'The Origin of Species'?

Alfred Russell Wallace

What phrase did Darwin use to summarize his view of life?

Descent with modification

What does the phrase 'descent with modification' imply?

All organisms are related through descent from a common ancestor

How did Darwin view the history of life?

Like a tree with branches representing life's diversity

What is artificial selection?

The process by which humans modify species by selecting and breeding individuals with desired traits

What are the two observations that led to Darwin's inferences about natural selection?

1. Members of a population vary in their inherited traits. 2. All species can produce more offspring than the environment can support.

What is the first inference Darwin made from his observations?

Individuals with inherited traits that increase survival and reproduction leave more offspring.

What is the second inference Darwin made from his observations?

The unequal ability to survive and reproduce leads to the accumulation of favorable traits in the population.

Who influenced Darwin's ideas on population growth and resource limitations?

Thomas Malthus

What happens to heritable traits that are advantageous over time?

They accumulate in a population, increasing the frequency of individuals with those traits.

What does natural selection increase over time?

The match between organisms and their environment

What can happen if an environment changes over time?

Natural selection may result in adaptation to new conditions and may give rise to new species.

What did Darwin conclude about the Galápagos finches?

Their adaptations are closely related to their environment.

What are the three broad observations Darwin made about life?

1. The unity of life. 2. The diversity of life. 3. The match between organisms and their environment.

What is the significance of fossils in Darwin's theory?

Fossils help fill in the morphological gaps between present-day groups.

What are the Galápagos Islands known for in relation to Darwin's studies?

They are known for the diverse species that contributed to Darwin's theory of natural selection.

What did Darwin argue about the process of natural selection?

It occurs in nature similar to artificial selection by humans.

What is the relationship between adaptation and natural selection?

Natural selection leads to adaptation as organisms better fit their environment.

What is the primary unit of evolution?

Populations evolve over time, not individuals.

What can natural selection increase or decrease?

Heritable traits that vary in a population.

What are the four types of data that document the pattern of evolution?

Direct observations, homology, the fossil record, and biogeography.

What is an example of natural selection in soapberry bugs?

Soapberry bugs have longer beaks when feeding on larger fruits and shorter beaks on smaller fruits.

What is MRSA?

Methicillin-resistant Staphylococcus aureus, a dangerous pathogen.

What is the significance of homologous structures?

They are anatomical resemblances that represent variations on a structural theme from a common ancestor.

What are vestigial structures?

Remnants of features that served important functions in an organism's ancestors.

What does convergent evolution demonstrate?

The evolution of similar features in distantly related groups due to adaptation to similar environments.

What does the fossil record provide evidence for?

The extinction of species, the origin of new groups, and changes within groups over time.

What is the significance of Darwin's theory of evolution by natural selection?

It integrates diverse areas of biological study and stimulates new research questions.

What is a biodiversity hotspot?

An area with high biodiversity and high threat levels, covering about 2.5% of the Earth's land surface.

What percentage of the world's plant, bird, mammal, reptile, and amphibian species are supported by biodiversity hotspots?

Nearly 60%.

What is the California Floristic Province (CAFP)?

A biodiversity hotspot known for its unique species like the Yellow-billed Magpie and Arboreal Salamander.

What does ongoing research in evolution aim to do?

Add to our understanding of evolution and test predictions of scientific theories.

What is the role of the local environment in natural selection?

It determines which traits will be selected for or against in a specific population.

What is homology in the context of evolution?

Similarity resulting from common ancestry

What are homologous genes?

Genes shared among organisms inherited from a common ancestor.

What is the importance of comparative embryology?

It reveals anatomical homologies not visible in adult organisms.

What evidence do fossil record provide?

1. Extinction of species, 2. The Origin of new groups 3. Changes within groups over time

What is the significance of gene flow between archaic hominins and humans?

It shows extensive genetic exchange that can complicate understanding of evolutionary history.

What does natural selection not do?

It does not create new traits but selects for traits already present in the population.

What is the relationship between introduced plant species and soapberry bug beak size?

Beak size correlates with the size of the fruit they feed on, influenced by the type of plant introduced.

How did MRSA strains evolve resistance to methicillin?

MRSA strains use a different protein in their cell walls, allowing them to survive methicillin exposure.