Variation and evolution

Variation and evoloution

What is variation?

↳ Differences in characteristics

What could have caused the variation (3)?

↳ Genes they inherited (eg-eye colour)

↳ The enviroment in which they developed (eg-language)

↳ Combination of genes and enviroment (eg-weight)

What are the steps of selective breeding (4)?

↳ Choose parents with the desired charcteristic

↳ Breed them together

↳ Choose offspring with the desired charcteristic and breed them

↳ Continue over many generations until all offspring show the desired characteristic

What are advantages of selective breeding (5)?

↳ Increase crop yield

↳ Animals can have more meat/milk

↳ Reduce food shortages

↳ More profit

↳ Domestic dogs with more gentle nature

What are disadvantages of selective breeding (4)?

↳ Can cause inbreeding

↳ Reduces the gene pool

↳ Increase risk of inherited defects

↳ More prone to diseases or poor health

What is genetic engineering?

↳ Changing a genome of an organism-for desired charcteristics

What are advantages of genetic engineering (3)?

↳ Overcome inherited diseases

↳ Higher value crops

↳ Crops can be resistant to herbicides

What are disadvantages of genetic engineering (3)?

↳ Ethical concerns-in the future people can manipulate genes of children

↳ Genes from GM plantscan spread

↳ Long term effects of eating GM plants haven’t been researched