3.2 - Plant and animal breeding

Question 1

Why do plant and animal breeders try to improve characteristics?

Answer 1

To provide a sustainable food source

Question 2

Why are plant field trials carried out in a range of different environments?

Answer 2

To compare the performance of different cultivars or treatments and to evaluate GM crops

Question 3

What does the selection of treatments ensure?

Answer 3

It ensures valid comparisons

Question 4

What does the number of replicates take account of?

Answer 4

The variability within the sample

Question 5

what does the randomisation of treatments allow?

Answer 5

It allows the bias to be eliminated when measuring treatment effects

Question 6

What is a Cultivar?

Answer 6

• A cultivar is a plant that has been created or selected intentionally for desirable characteristics that can be maintained by cultivation
• A cultivar is different from others in at least one characteristic or trait

Question 7

Why are selected related plants and animals bred for several generations in inbreeding?

Answer 7

so that till the population breeds true to the desired type which is due to the elimination of heterozygotes

Question 8

What can a result of inbreeding be?

Answer 8

An increase in the frequency of individuals who are homozygous for recessive deleterious alleles