Selective Breeding
Overview
Long before scientists understood DNA, farmers and breeders were shaping the plants and animals around them. By choosing individuals with the best traits and breeding them together, generation after generation, humans have transformed wild grasses into high-yielding wheat and wolves into hundreds of dog breeds.
In this lesson you will learn how selective breeding works in both plants and animals, examine real examples of the process, and consider the risks that come with narrowing a population's gene pool.
Objectives
- Understand how selective breeding can develop plants with desired characteristics
- Understand how selective breeding can develop animals with desired characteristics
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Selective Breeding. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What is selective breeding? A) Breeding organisms that are naturally selected by the environment B) Choosing organisms with desired traits and breeding them over many generations C) Genetically modifying organisms in a laboratory D) Allowing organisms to breed randomly Answer: B
- Which of the following is a risk of selective breeding? A) Increased genetic diversity B) Organisms become better adapted to the wild C) A reduced gene pool and increased chance of genetic defects D) Faster evolution of new species Answer: C
- Wild brassica has been selectively bred into broccoli by selecting for which feature? A) Large leaves B) Large flower buds C) Large terminal buds D) Thick stems Answer: B
- A farmer selectively breeds sheep for thick wool. Which step must be repeated? A) Cross the sheep with wild sheep once B) Select and breed the woolliest sheep over many generations C) Genetically modify the sheep's DNA D) Feed the sheep a high-protein diet Answer: B
- What does the term 'gene pool' mean? A) The total number of genes in one organism B) The total variety of alleles in a population C) The number of chromosomes in a cell D) The location of genes on a chromosome Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
Want to practice mock questions on Selective Breeding? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
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