5b (Selective breeding) Flashcards
1
Q
What is selective breeding?
A
Selective breeding is when man choose 2 parents with the desired characteristics.
He reproduces them and the gene for desired characteristic is passed onto offspring.
When he gets offspring he again chooses the 2 with the desired characteristics to be the new parents.
Over many years the selectively bred individuals will have better quality for that desired characteristic than the original type
2
Q
How man organises sex between plants
A
Male stamen (anther + filamnet) cut off before pollen mature.
Man stops other pollen from pollinating stigma by putting a cotton (muslin) bag over the carpel.
He brushes the pollen on from his chosen male plant.
3
Q
Plant/Crop selective breeding objectives
A
- Provide higher yields
- Develop resistance to diseases and pest damage
- Hardier
- Better balance of nutrients
4
Q
Animal selective breeding objectives
A
- Produce more meat, milk, eggs…
- Produce more fur
- More offspring
- Increased resistance to pathogens
