Koch's postulates are the established rules for determining that a specific pathogen causes a specific disease.
a. true
b. false

a. True

Explanation: These postulates were formulated by Robert Koch as a result of his experiments with healthy and infected mice. The postulates are often used to determine if a phatogen causes a disease. These are:

The pathogen must be present in sick individuals but not in healthy ones. The pathogen must be isolated from individuals and cultivated in a pure culture.The pathogen cultivated must cause sickness when it's injected in suceptible inviduals.The pathogen must be isolated from the injected individuals and must be exactly as the first one.

The punnett square is the device used to predict genetics.