Where variation comes from
Where variation comes from
Variation within a population is essential because evolution is a change in allele frequencies over generations. A species is a group that can interbreed to produce fertile offspring, and a population is defined as that species living in the same place at the same time.
Step-by-step lessons on Eduqas A Level Biology Variation and evolution. Each one builds up to exam-style questions. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.