Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters. Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

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Answer 1

Question

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

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Because of selective forces, the dinosaurs were superbly adapted to their environments. After the dinosaurs became extinct, the small mammals that had been relatively unimportant animals in the background flourished and evolved into many new types, including the line that led to human beings. It is unlikely that these new types would have ever evolved had not the dinosaurs disappeared. If the extinction of the dinosaurs was caused by an extraterrestrial impact, did it matter how well they were adapted to their environment? What does this suggest about the starting cause in the evolutionary success of these new types of mammals?

The figure shows a phylogenetic tree of various members of the order Proboscidea, which includes modern elephants. Which of the following claims is best supported by the information in the figure ? a.The mastodon and the Stegodon diverged from their common ancestor 22 million years ago. b.The common ancestor of the African elephant and the mastodon is the Palaeomastodon. c.The mammoth diverged from its most recent common ancestor with African elephants before the mastodon diverged from its most recent common ancestor with Stegodons. d.The Asian and African elephants are the most closely related species shown on the tree.

Anole lizards can be found on many islands in the Caribbean that share similar environmental habitats. Anoles on the different islands share similar ecological morphotypes because of their similar habitats. Anoles on each island have evolved from a common ancestor into a variety of different species that occupy different ecological niches as shown below. Which of the following statements explains how the morphotypes found on one island, and shown in the figure, occurred as a result of speciation? A - Convergent evolution occurred, causing new species to evolve based on diverse new habitats. B - Phenotypic diversification occurred as a result of divergent evolution as the anoles adapted to new habitats. C - Natural selection occurred, so individual anoles with certain phenotypes can survive and reproduce only in a specific ecological niche. D - Reproductive isolation occurred as a result of habitat isolation since the anoles are unable to move into different ecological niches to breed.

Answer 2

Question

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

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Answer 3

Question

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

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Answer 4

Question

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

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Answer 5

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Answer 6

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Answer 7

Chapter 20, Problem 5PDT

Summary Introduction

To explain: Whether the pattern of rate of evolutionary changes over time intervals holds true for most characters.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Answer 8

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Answer 9

Summary Introduction

To explain: Whether this pattern of rate of evolutionary changes over time intervals implies that the evolution of major new characters, such as the wings of bats, should occur very rapidly.

Introduction: The degree and rate of evolutionary changes vary in all organisms. For example: the rates of evolutionary change measured over short time intervals are often very high. However, rate of evolutionary changes that is measured over long time intervals are generally much lower.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 20 - Prob. 1PDT Ch. 20 - Prob. 2PDT Ch. 20 - Prob. 3PDT Ch. 20 - Prob. 4PDT Ch. 20 - Prob. 5PDT

Solution Summary: The author explains that the pattern of rate of evolutionary changes over time intervals does not hold true for most characters.

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