Evolution by natural selection

• The individual organisms in any species show a wide range of variation, because genes inherited are through meiosis and sexual reproduction
• Changes in the gene arise from a mutation which is a change in the DNA Code
• Mutation can occur whenever a cell divides
• Mutations that take place when the gametes are formed affect the phenotype of the offspring, and introduce new variants into the genes of a species
• Some mutations can cause organisms to die
• Evolution by natural selection states all species have evolved from simple life forms
• Evolution by natural selection changes inherited characteristics of a population that results in organisms well suited to environment, resulting in formation of new species sometimes
• Individuals with desired characteristic suited to environment are more likely to survive and breed, so they then pass on their desired characteristic (alleles) to their offspring
• If a population of 1 species became so different they can no longer interbreed, they have formed a new species
• New variants arise from a mutation so there's sometimes a rapid change in a species especially if environment changed
• If it's an advantageous mutation it's more likely to survive & breed & sell well soon became very common