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Lamarck's Evolution Theories

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Questions and Answers

What is the primary reason suggested for the survival of long-necked giraffes?

Their stronger resistance to diseases affecting shorter-necked giraffes

Their increased speed in running from predators

Their ability to reach food on tall trees when low vegetation is scarce (correct)

Their natural camouflage against predators in tall grass

Which of the following best describes gene flow?

The movement of genes from one population to another due to migration and interbreeding (correct)

The random change in gene frequencies within a population over time

The process by which organisms with favorable traits are more likely to survive

The change in gene frequencies due to mutations in the population

What is the primary focus of the synthetic theory (neo-Darwinian synthesis)?

The explanation of how natural selection acts on genetic variations within populations

The study of genetic mechanisms and reevaluation of fossil records

The combination of Darwin's theory of evolution and Mendel's principles of genetics (correct)

The understanding of how mutations contribute to the diversity of organisms

Which of the following is NOT a condition required for the Hardy-Weinberg equilibrium?

Presence of natural selection acting on the population Signup and view all the answers

Which of the following best defines natural selection?

The process by which nature selects organisms based on their existing traits Signup and view all the answers

What is the primary cause of genetic drift?

Random changes in gene frequencies due to chance events Signup and view all the answers

What was the key difference between Lamarck's and Darwin's theories of evolution?

Lamarck believed in the inheritance of acquired characteristics, while Darwin believed in natural selection. Signup and view all the answers

According to Lamarck's Theory of Use and Disuse, what happens to organs that are constantly used?

They will become larger and more developed. Signup and view all the answers

What is the main idea behind Lamarck's Theory of Need?

Organisms change in response to their own needs. Signup and view all the answers

What was the key difference between the giraffes' neck lengths in Lamarck's and Darwin's theories of evolution?

Lamarck believed the giraffes' long necks were acquired through use, while Darwin believed they were the result of natural selection. Signup and view all the answers

What is the meaning of the word "evolve" according to the text?

To change gradually. Signup and view all the answers