Variation: What Differs, and Why?
Variation: What Differs, and Why?
An organism's phenotype is its observable physical and physiological traits, while its genotype is its specific set of alleles. Phenotypic variation is driven by genetic factors, environmental influences, or a combination of both.
Step-by-step lessons on OCR A A Level Biology Patterns of inheritance. 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.