Unit 4: Agriculture - Manipulation of Food Species (Sexual Reproduction)
- Created by: rosieevie
- Created on: 15-05-15 16:42
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- Manipulation of Food Species - Sexual Reproduction
- Selective Breeding - exaggerate a single desirable characteristic or combine several
- Bulls - high meat:fat ratio and high gross productivity
- Crops - high nutrient, strong stem, pest/weather resistance, appealing to the eye and good taste
- Dairy cows - high milk production and low fat content in milk
- Crossbreeding between breeds used - reduces problems of inbreeding
- Hybrid vigour - good health produced by breeding non-closely related varieties
- Heterosis - hybrid vigour produced by breeding non-closely related organisms
- Artificial Insemination - sperm from desirable bull inserted into a female
- Many cows can be fertilised by one bull
- Desirable traits maintained after bull's death
- Cow breeding synchronised, allowing easier herd management
- Reduces genetic diversity
- Embryo Transfer - cow treated with FSH producing more eggs then artificial insemination or fertilised eggs are removed and frozen
- Able to choose cow's sex
- Used to produce multiple offspring
- The Green Revolution - high yielding cereal varieties selectively bred
- Variety IR8 had short, stiff stems and a higher biomass
- Increased harvests and reduced famine problems
- Only farmers who could afford seeds were able to grow crop
- Poorer farmers did not benefit and lost their farms due to lack of funds
- Poor farmers unable to work on other farms due to machinery replacements
- Variety IR8 had short, stiff stems and a higher biomass
- Selective Breeding - exaggerate a single desirable characteristic or combine several
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