Selective Breeding- B6.2.3
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5 Terms
what is selective breeding?
breed other animals and plants to produce a particular characteristic- help feed increasing pop
why is selective breeding used?
produce crop/animal that has increased biomass
produce crop/animal that is more disease resistant
crop/animal is more able to survive in adverse weather
how do farmers selectively breed animals/crops?
decide which characteristic in the species is desired
select parent with high amount of that desired characteristic
only breed offspring that have favourable characteristic (alleles)
repeat over many generations
disadvantages of selective breeding
increased chance of inheriting genetic disease
reduces number of alleles of a species- reduces variation which mean more diseases arise
what are the percentiles ranks?
tgis is where a table shows results about frequencies of an animal or plant
the medium is the 50th percentile
top 25% results are at or above the 75th percentile and the bottom 25% are at or below the 25th percentile.
Note 
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