B2.2.3

Question 1

What is selective breeding

Answer 1

When plants and animals are bred for a specific characteristic

Question 2

How is selective breeding done in plants

Answer 2

Cross plants with high resistance to disease with high-yielding plants to produce high-yielding disease resistant plants.

Question 3

What are the steps of selective breeding

Answer 3

1. Decide on which characteristics of species are desirable
2. Select parent with high levels of characteristic
3. Bread from these individuals
4. Select offspring and breed again
5. Repeat for many generations

Question 4

What are the disadvantages of selective breeding 1

Answer 4

Reduces the number of alleles of a species which reduces variation. This means that, if a new disease arises, there may not be an organism that has the allele for resistance to the disease. The species may become extinct.

Question 5

What are the disadvantages of selective breeding 2

Answer 5

Increases the chance of inheriting a genetic disease