Science Knowt 6/12

What is the common ancestor of the finches?

All finches are descended from a common ancestor that arrived on the islands long ago.

How did the finches adapt to different environments?

Finches developed different beak shapes and sizes based on the food sources available on each island.

What adaptations did finches with large beaks develop?

They evolved large, powerful beaks for cracking hard seeds.

What adaptations did finches with small beaks develop?

They evolved smaller, thinner beaks for eating softer seeds or insects.

What event in 1977 affected the finch population on Daphne Major?

A major drought caused a scarcity of soft seeds, leading to higher survival rates for finches with larger beaks.

What is natural selection?

Natural selection is the differential survival or reproduction of different inherited traits in a population.

How did heavy rainfall from El Niño affect the finches?

It allowed plants with smaller, softer seeds to grow, giving an advantage to finches with smaller beaks.

What is speciation?

Speciation is the process by which a group of organisms evolves over time and becomes a new species.

What evidence did the finches provide for speciation?

Groups of finches became separated on different islands and adapted to different environments, leading to reproductive isolation.

What is a trace fossil?

Trace fossils are preserved signs of an organism's activity, such as footprints, burrows, and nests.

How do scientists use observations and inferences?

Scientists make observations to see measurable evidence and use inferences to explain those observations based on prior knowledge.

What is embryology?

Embryology is the study of embryos, providing evidence for evolution and common ancestry.

What early similarities do embryos of different animals share?

Embryos of many animals, such as fish, birds, reptiles, and humans, look very similar in early stages.

What does the similarity of embryos suggest?

It suggests that different species are related and have changed over time from shared ancestors.

Define adaptation in the context of evolution.

Adaptation is a heritable trait favored by natural selection for its current function.

What is evolution?

Evolution is a change in the inherited characteristics of populations from one generation to the next.

What does it mean for a species to be extinct?

A species is extinct if it has no living members.

What is a fossil?

A fossil is a trace of a living organism.

What is a mutation?

A mutation is a change in the DNA of a gene that may lead to a different trait.

What is reproductive success?

Reproductive success is a measure of how many successful offspring an individual organism produces.

What is variation in a population?

Variation is a difference in genes, traits, or behaviors among members of a population.

What is Pakicetus?

Pakicetus is an early ancestor of modern whales that lived on land, resembling a small dog or wolf.

How did Pakicetus adapt to its environment?

Pakicetus developed webbed feet and an elongated snout to help it hunt for fish and other small animals along the water's edge.

What is the significance of Pakicetus in whale evolution?

Pakicetus represents a crucial transitional form in the evolution of whales, illustrating the shift from land-dwelling to fully aquatic life.

What role does DNA play in evolution?

DNA variations within populations can lead to traits that provide advantages, influencing survival and reproduction.

What is the process of natural selection?

Natural selection is the process through which individuals with beneficial traits are more likely to survive and reproduce, passing those traits to future generations.

How can small changes over time lead to new species?

Over millions of years, the accumulation of small evolutionary changes can result in populations developing into entirely new species.

What physical evidence supports the evolution of modern whales?

The remains of finger bones in modern whales serve as evidence of their ancestors' land-dwelling lifestyle.

What does embryological development indicate about evolution?

Similarities in embryological development across different species suggest shared ancestry and evolutionary relationships.

What is the significance of bacteria's short lifespan in studying evolution?

Bacteria have short generational times, allowing scientists to observe evolutionary changes over many generations in a short period of time.

How does antibiotic resistance occur in bacterial populations?

When antibiotics are introduced, only resistant bacteria survive and reproduce, leading to a population increasingly dominated by resistant strains.

What did Lamarck believe about evolution?

Lamarck believed organisms could change during their lifetime by using or not using certain body parts, passing those changes to offspring.

What is Darwin's explanation of evolution through natural selection?

Darwin proposed that individuals with favorable traits are more likely to survive and reproduce, leading to those traits becoming more common in the population over generations.

How does rainfall affect finch populations on the Galápagos Islands?

Changes in rainfall influence food sources, affecting which finches can survive and reproduce based on their beak size suited to available seeds.

What is a trace fossil?

Trace fossils are preserved signs of an organism's activity, like footprints, that can indicate behavior rather than physical structure.

How did the Industrial Revolution impact the peppered moth population?

Pollution darkened tree bark, favoring dark-colored moths for camouflage, leading to their increased survival and reproduction compared to lighter moths.

How do embryos of different species suggest common ancestry?

Similarities in early embryonic development among diverse species indicate they share a common ancestor before evolving into distinct forms.

What are homologous structures?

Homologous structures are anatomical features in different species that show a common evolutionary origin, despite having different functions.

How can studying skeletal structures support the theory of common ancestry?

Comparative analysis of skeletal structures reveals similarities across species, suggesting they evolved from a shared ancestor over time.

Why is it easier to study adaptation and evolution in bacteria compared to larger organisms?

Bacteria reproduce rapidly, allowing scientists to observe many generations and evolutionary changes in a short time.

How does generation time affect our ability to study evolution?

Shorter generation times enable researchers to witness evolutionary changes more quickly, as organisms can undergo many generations in a brief period.

What happens to bacteria in the strep throat simulation when the patient misses doses of antibiotics?

When doses are missed, some bacteria survive due to varying levels of resistance, allowing them to reproduce and spread resistance traits.

Was the strep throat illness the same at the beginning and end of the simulation?

No, the bacterial population evolved, with more resistant strains becoming predominant by the end of the simulation.

How does genetic variation influence bacterial survival during antibiotic treatment?

Genetic variation results in different resistance levels, leading to some bacteria surviving antibiotics while others do not.

What effect can improper antibiotic usage have on bacterial populations?

Improper use can lead to increased antibiotic resistance, as surviving bacteria reproduce and spread resistant traits.

How does the environment impact an organism's rate of survival and reproduction?

Environmental changes can favor certain traits, determining which organisms survive and reproduce successfully.

What is the story of the peppered moth in England regarding natural selection?

Initially, light moths thrived due to camouflage, but pollution favored darker moths, leading to increased survival and reproduction of the dark variant.

How did genetic variation contribute to the peppered moth population change?

The existence of both light and dark colored moths allowed for natural selection to favor dark moths, enhancing survival rates in polluted environments.

How do Darwin and Lamarck differ in their explanations of evolution?

Lamarck believed in acquired traits being inherited, while Darwin emphasized natural selection acting on existing genetic variations.

What role does genetic variation play in natural selection?

Genetic variation provides the raw material for natural selection, allowing some individuals to have advantageous traits that improve survival and reproduction.

How would Darwin explain long necks in giraffes?

Darwin would say long necks evolved through natural selection, favoring giraffes with longer necks that could reach more food.

How would Lamarck explain the long necks of giraffes?

Lamarck would argue that giraffes stretched their necks to reach high leaves and passed this trait to their offspring.

What is the significance of genetic variation in peppered moths?

Genetic variation allowed for some moths to survive better in changing environmental conditions, leading to shifts in the population over time.