Mechanisms of Evolution - Introduction

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11 questions

Instructions

Mechanisms of Evolution

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Follow along during the lecture, after each slide you will need to answer a question or qustions assesing your undrestanding of the material. 

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Think about the different animals you know. Why do you think some animals are better suited to their environment than others? Answer the question by giving a specific example of an animal and a trait that would make it better suited for a specific environment.

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A disaster reducing the population to a small number, followed by recovery and expansion.

A small group splintering off and starting a new colony, affecting the gene pool of the new population.

Genetic variation caused by random mate selection and fertilization.

Increased competition for limited resources in a population.

It expands with increased genetic diversity.

It narrows with some alleles lost.

It remains unchanged.

It becomes more similar to the original population.

Gene flow can result in genetic mixing across regions.

Gene flow can increase the differences between populations.

Gene flow tends to cause a population to become more genetically isolated

Migration and distribution can alter allele frequencies within sub-populations.

True

False

Mutations create _______ _______ .

Mutations change the _______ _______ sequence.

Crossing over is the only source of genetic variation.

Siblings with the same parents will always look identical because of crossing over.

Crossing over leads to genetic variation in offspring.

Crossing over occurs during the formation of eggs and sperm.

Organisms with beneficial traits are more likely to survive and reproduce.

Natural selection leads to a decrease in the number of organisms in a population.

Organisms that are not well-adapted to their environment are less likely to survive.

Natural selection is a random process that does not depend on an organism’s traits.

Which of the following best describes the Founder Effect?

A disaster reducing the population to a small number, followed by recovery and expansion.

A small group splintering off and starting a new colony, affecting the gene pool of the new population.

Genetic variation caused by random mate selection and fertilization.

Increased competition for limited resources in a population.

What happens to the gene pool of a population after a bottleneck event?

It expands with increased genetic diversity.

It narrows with some alleles lost.

It remains unchanged.

It becomes more similar to the original population.

Which of the following best describes the effects of gene flow on a population? Select all that apply:

Gene flow can result in genetic mixing across regions.

Gene flow can increase the differences between populations.

Gene flow tends to cause a population to become more genetically isolated

Migration and distribution can alter allele frequencies within sub-populations.

Crossing over leads to genetic variation.

True

False

Which of the following statements are true about recombination and crossing over? Select all that apply:

Crossing over is the only source of genetic variation.

Siblings with the same parents will always look identical because of crossing over.

Crossing over leads to genetic variation in offspring.

Crossing over occurs during the formation of eggs and sperm.

Which of the following statements correctly describes the process of natural selection? Select all that apply.

Organisms with beneficial traits are more likely to survive and reproduce.

Natural selection leads to a decrease in the number of organisms in a population.

Organisms that are not well-adapted to their environment are less likely to survive.

Natural selection is a random process that does not depend on an organism’s traits.