AP BIOLOGY

Detailed explanation-1: -Darwin did not know that genes existed, but he could see that many traits are heritable-passed from parents to offspring. Mutations are changes in the structure of the molecules that make up genes, called DNA. The mutation of genes is an important source of genetic variation within a population.

Detailed explanation-2: -In Summary: Darwin and the Theory of Evolution Variation arises ultimately from genetic mutations. Diversity is further encouraged through sexual reproduction. As environments change, selective pressures shift and favor different adaptations. In this way, given thousands or millions of years, species evolve.

Detailed explanation-3: -Mendel and Darwin were contemporaries, with much overlap in their scientifically productive years. Available evidence shows that Mendel knew much about Darwin, whereas Darwin knew nothing of Mendel.

Detailed explanation-4: -For the past century, an assumption central to Charles Darwin’s evolutionary theory is that mutations are random and accidental and that natural selection favors such accidents.