Selective Breeding

Question 1

Selective breeding/artificial selection

Answer 1

The changing of a populations gene pool due to humans altering the breeding behaviour of animals and plants to develop a desired trait

Question 2

Selective breeding and genetic diversity

Answer 2

Decreases genetic diversity more than natural selection as natural selection selects a variety traits as a result of a variety of selection pressures, but artificial selection only selects for one trait

Question 3

Artificial selection steps

Answer 3

1. Variation - individuals in a population vary genetically
2. Heritability - individuals can pass on their traits to offspring
3. Intervention - selection is determined by humans who alter the breeding population
4. Breeding - breeding population reproduces naturally or through human-induced breeding, occurs over many generations

Question 4

Natural selection steps

Answer 4

1. Variation - individuals in a population vary genetically
2. Heritability - traits are passed into offspring
3. Environmental selection pressures - causes struggle for survival, some survive and reproduce better as a result of an advantageous phenotype
4. Fitter organisms pass on their genes - traits become more common, changing allele frequencies