selective breeding

• organisms are selectiveltly bred to develop features that are useful or attractive
• selective breeding


  -from existing stock select the ones which have the characteristics you are after

  -breed them with each other

  -select the best offspring and breed them together

  -continue this process over several generations and the desirable trait gets stronger and stronger so eventually all the offspring will have the chracteristics
• in agriculture, selective breding is used to improve yields
• main problem though is that is reduces the number of diff alleles in a population
• inbreeding can cause a lot of different health problems as there is more chance of theorganism inheriting harmful genetic defects