Evolution

Question 1

What is the theory of evolution?

Answer 1

All of today’s species have evolved from simple life forms that first started to develop over three billion years ago.

This theory encompasses the changes in species over time due to various factors, primarily natural selection.

Question 2

Who proposed the theory of evolution by natural selection?

Answer 2

Charles Darwin

Darwin’s observations and studies during his voyage contributed significantly to this theory.

Question 3

What is phenotypic variation?

Answer 3

Variation in characteristics among organisms in a species.

This variation is crucial for natural selection as it affects an organism’s ability to survive and reproduce.

Question 4

What is meant by ‘survival of the fittest’?

Answer 4

Organisms with the most suitable characteristics for their environment are more likely to survive and reproduce.

This concept is central to Darwin’s theory of natural selection.

Question 5

What happens to successful organisms in terms of reproduction?

Answer 5

They are more likely to reproduce and pass on their successful characteristics to their offspring.

This process contributes to the evolution of species over generations.

Question 6

What is speciation?

Answer 6

The development of a new species over time due to significant changes in phenotype.

This occurs when populations become reproductively isolated.

Question 7

List the reasons why species become extinct.

Answer 7

• Environment changes too quickly
• New predators
• New diseases
• Competition with new species
• Catastrophic events

Extinction results when no individuals of a species remain.

Question 8

What is the significance of the fossil record in evolution?

Answer 8

It provides evidence of species that no longer exist and shows how organisms have changed over time.

The fossil record is crucial for understanding the history of life on Earth.

Question 9

What controversy surrounded Darwin’s theory when first published?

Answer 9

It contradicted religious beliefs about the development of life on Earth.

Darwin’s theory offered a naturalistic explanation without invoking a creator.

Question 10

What did Darwin lack knowledge about that limited his explanation of evolution?

Answer 10

Genes and mutations.

These concepts were not discovered until decades later, which hindered his ability to explain inheritance.

Question 11

Who was Jean-Baptiste Lamarck and what was his hypothesis?

Answer 11

He proposed that characteristics acquired during an organism’s lifetime could be passed to offspring.

This idea was eventually rejected in favor of Darwin’s theory.

Question 12

What experiment disproves Lamarck’s hypothesis regarding inheritance?

Answer 12

Dyeing a hamster’s fur bright pink will not result in its offspring being born with pink fur.

This illustrates that acquired traits are not inherited.

Question 13

What evidence supports Darwin’s theory of evolution?

Answer 13

• Discovery of genetics
• Fossil records
• Bacteria evolving resistance to antibiotics

These findings validate the mechanisms of natural selection and evolution.

Question 14

What is the current status of Darwin’s theory?

Answer 14

It is now an accepted hypothesis (theory).

Extensive evidence has solidified its acceptance in the scientific community.