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Give an example of convergent evolution and explain how it supports the theory of evolution by natural selection. a. An example of convergent evolution is the development of the same function, swimming, in organisms that live in different parts of the globe, such as Arctic beluga whales and Antarctic right whales. The fact that organisms that do not come in contact with each other have developed the same traits suggests that natural selection can produce similar adaptations in organisms who share a similar environment b. An example of convergent evolution is the set of adaptations, such as better running speed or more efficient hunting, developed by a species in response to competition with a new species that moves into the same region. The fact that a species adapts after it comes into contact with a competitor suggests that natural selection works more quickly with higher selective pressures. c. An example of convergent evolution is the development of an ancestral structure, a limb, into two different modern structures, such as a hand and a flipper. The fact that natural selection can cause a structure to develop down two different pathways due to different environmental conditions supports the theory of evolution d. An example of convergent evolution is the development of the same function, flying, in organisms that do not share a recent common ancestry, such as insects and birds. The fact that wings that allow flight have developed from very different original structures suggests that the process of natural selection can produce similar adaptations in two very different types of organisms who share a similar environment

Step by step solution

01

Understanding Convergent Evolution

Convergent evolution occurs when different organisms independently evolve similar traits. This is usually due to having to adapt to similar environments or ecological niches, despite not being closely related.

02

Analyze Examples

Evaluate each given example to identify which best illustrates convergent evolution. The key is to find organisms with similar functions or structures that evolved independently due to similar environmental pressures.

03

Example a - Whales

Arctic beluga whales and Antarctic right whales live in separate regions and have developed similar swimming functions independently. This illustrates how natural selection can promote similar traits in different environments.

04

Example b - Competition

Adaptations arising from species competition is not a case of convergent evolution, as it focuses more on competitive interaction rather than evolving similar traits due to similar environments.

05

Example c - Limb Development

This example discusses divergent evolution, where a common ancestral structure evolves into different functions, such as a hand and a flipper, due to different environments.

06

Example d - Flying

Both insects and birds have developed wings for flying, but from different ancestral structures. This supports convergent evolution as wings evolved independently in both groups due to a similar need to navigate their environments.

07

Selecting the Best Example

Compare Example a and Example d, as both are cases of convergent evolution. The better example of convergent evolution is d because it involves a more diverse set of organisms (insects and birds) developing similar functions (flying).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

natural selection

Natural selection is a fundamental concept in evolutionary biology.
It drives the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
This mechanism explains how species evolve over time.
The key components include:

• Variation: Different individuals in a population have different traits.
• Inheritance: Traits are passed down from parents to offspring.
• High rate of population growth: More offspring are produced than can survive.
• Differential survival and reproduction: Individuals with traits better suited to the environment are more likely to survive and reproduce.

Over many generations, this process results in changes in the traits of the population, making them better suited to their environment.

adaptive traits

Adaptive traits are characteristics that increase an organism's chance of survival and reproduction in a particular environment.
These traits result from the process of natural selection.
Examples of adaptive traits include:

• Camouflage: Enables organisms to blend in with their surroundings to avoid predators.
• Fat storage: Allows animals to survive periods of food scarcity.
• High-speed running: Helps predators catch prey or prey to escape predators.

Adaptive traits can be anatomical, physiological, or behavioral.
They enhance the organism鈥檚 fitness, meaning its ability to survive and reproduce in its environment.

evolutionary pressures

Evolutionary pressures are factors that influence the survival and reproduction of organisms.
These pressures drive the process of natural selection.
Some common types of evolutionary pressures include:

• Predation: Predators apply pressure on prey species to evolve better defense mechanisms.
• Competition: Species compete for resources like food, territory, and mates, driving the evolution of traits that improve competitive success.
• Environmental conditions: Climate, availability of water, and other environmental factors create pressures that organisms must adapt to.
• Sexual selection: Traits that improve an individual's chances of attracting a mate are selected for, even if they do not necessarily enhance survival.

These pressures shape the genetic makeup of populations over time, guiding the evolutionary process.

environmental adaptation

Environmental adaptation refers to the process by which organisms adjust to their surroundings to improve their chances of survival and reproduction.
This process can occur over many generations and involves several mechanisms:

• Physiological adaptations: Changes in an organism's internal functions, such as developing tolerance to extreme temperatures.
• Behavioral adaptations: Changes in how an organism behaves, like migration to avoid harsh winters.
• Morphological adaptations: Physical changes in structure, like the development of webbed feet in ducks for better swimming.

Adaptations allow organisms to exploit new environments and ecological niches, contributing to the diversity of life on Earth.
Environmental adaptation underscores how closely connected organisms are to their habitats.