Biology Genetics Practice Test

Probability describes the likelihood that a particular event will occur. In genetics and biology, we use probability to express how likely different outcomes are—for example, the chance of obtaining a certain genotype from a cross. This term directly matches the idea of how likely an event is. The speed of a reaction is the rate at which reactants become products. The outcome of a Punnett square refers to the predicted results of a cross, not the general term for likelihood. The measurement of allele frequency describes how common an allele is in a population, not the chance of a single event.