3.2

Question 1

When designing field trails, take into account:

Answer 1

Selection of treatments- ensure valid comparisons

Randomisation of treatments - Eliminate bias

Number of replicates - take into account of the variability within the sample

Question 2

Plant and animal breeding…

Answer 2

Are used to improve characteristics and to help support sustainability food production

Question 3

Selective breeding

Answer 3

Is done in order to produce new and improved cultivar of a plant or breed if an animal that will provide a sustainable source of food for humans

Question 4

True breeding

Answer 4

Only when homozygotes are used

Question 5

Test cross

Answer 5

Used between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait

Question 6

Outbreeding

Answer 6

Fusion of two gametes from unrelated members of the same species

Question 7

Inbreeding

Answer 7

Involves the fusion of two gametes from close relative

Question 8

Effects of interbreeding

Answer 8

Ensure that the members of stain recessive alleles for the desired characteristics

Question 9

Interbreeding also leads to

Answer 9

Loss of heterozygosity

Interbreeding depression

Question 10

Loss of heterozygosity

Answer 10

Continuous interbreeding leads to a loss of heterozygosity and development of homozygosity
And leads to reduction of variation in species

Question 11

Inbreeding depression

Answer 11

If a natural outbreeder is forced to inbreed inbreeding depression can occur