improvements Flashcards
1
Q
use of sexual reproduction to produce new and improved varieties of food and crops
A
- hybrid crops (cross-pollinated of dissimilar genotypes)
- new desirable traits
- not genetically modified
2
Q
what improvements have been brought about by hybridisation?
A
- more vigorous (less land)
- improved disease resistance
- earlier maturity
- extended growing season
- increased yield
- quality improvement
3
Q
what is a polyploid plant?
A
- more than two homologous sets of chromosomes
- disturbance in mitosis or meiosis
- sees treated with the chemical colchicine
4
Q
advantages of polyploidy agriculture
A
- seedless varieties
- bigger plant
- larger flowers
- bigger fruits
5
Q
mutagenesis
A
- free of regulatory restrictions
6
Q
mutagen breeding
A
- exposing seeds to mutagens
- desirable traits
- novel variation
7
Q
seed banks
A
- to maintain biodiversity
- stores various wild plants
- endangered species
- endemic species
- species that might become endangered due to over-exploitation
8
Q
how do seed banks help to maintain biodiversity?
A
- offer protection against loss of species in the wild
- habitat loss
- climate change
- over-exploitation
- re-establishment
- re-introduction
- production of plant material
- ensure genetic diversity and safeguard future corps
