1. explain how a doctor might use a pedigree to understand whether a person's disease has a genetic link.

2. describe how a punnett square scientists understand the results of some genetic crosses.

Answer no 1:

A pedigree can be described as a chart or a diagram which illustrates the patterns of inheritance among generations of a family. Family history is very important to know the genetic history of a disease and how it runs in a family. A pedigree will let know that what are the probabilities of a disease to occur in the offsprings based on the genetic history.

Answer no 2:

A punnet square can be described  as a diagram which predicts the result of a cross. A genetic cross will let scientists know about the genotype and phenotype of the offsprings that will be produced. It will let us know about carriers as well probability of a disease to occur in offsprings.