The Impact of Selective Breeding on Animals and Food Crops

The video explains selective breeding, also known as artificial selection, and its impact on food plants and domesticated animals. It provides historical context, using wolves and dogs as examples, and describes four key examples of selective breeding. The process of selective breeding is detailed, including the selection of traits over generations. The video also highlights the disadvantages, such as inbreeding and inherited defects, using dog breeds as an example.

What is another term for selective breeding?

• Natural selection

• Crossbreeding

• Artificial selection

• Genetic modification

Why did humans initially find wolves useful?

• They could be used for farming

• They helped in building shelters

• They were a source of food

• They provided companionship and protection

Which of the following is NOT an example of selective breeding?

• Breeding cows for more milk

• Breeding fish to swim faster

• Breeding wheat to resist disease

• Breeding dogs for a gentle nature

What is the main goal of selective breeding in food crops?

• To change their taste

• To increase their size

• To make them more colorful

• To make them disease-resistant

What is the first step in the selective breeding process for large cows?

• Breed any two cows randomly

• Select cows based on color

• Select the largest male and female

• Select the smallest male and female

How does selective breeding affect the variation in offspring?

• It eliminates variation completely

• It increases variation

• It has no effect on variation

• It reduces variation over generations

Which animal is used as an example to explain the process of selective breeding?

• Pigs

• Sheep

• Cows

• Chickens

What is the outcome of continuous selective breeding over many generations?

• Offspring show no change

• All offspring become smaller

• All offspring become larger

• All offspring become identical

What is a major risk associated with selective breeding?

• Improved resistance to all diseases

• Increased biodiversity

• Faster growth rates

• Inbreeding and inherited defects

What is a potential consequence of inbreeding in dog breeds?

• Increased lifespan

• Improved intelligence

• Inherited disorders like epilepsy

• Better hunting skills