Get Studying Pedigrees Activity

What is Pedigree Analysis? Pedigree analysis was developed to understand the inheritance of genes from parents to offspring. It was developed as a chart that can represent a family tree along with the family members and their genetic traits, respectively.

Types of Pedigree Analysis Autosomal dominant pedigree. Autosomal recessive pedigree.

These diagrams are used to determine the mode of inheritance of a particular disease or trait, and to predict the probability of its appearance among offspring. Pedigree analysis is therefore an important tool in both basic research and genetic counseling.

A pedigree shows relationships between family members and indicates which individuals have certain genetic pathogenic variants, traits, and diseases within a family as well as vital status. A pedigree can be used to determine disease inheritance patterns within a family.

A pedigree chart displays a family tree, and shows the members of the family who are affected by a genetic trait. This chart shows four generations of a family with four individuals who are affected by a form of colorblindness. Circles represent females and squares represent males.

For each person, record the following under the pedigree symbol: Name. Date of birth (if known, the date of birth is preferable to current ages or estimates) Relevant symptoms and/or diagnoses and age at diagnosis (if known) Cause of death and age at death (if known)

Reading a pedigree Determine whether the trait is dominant or recessive. If the trait is dominant, one of the parents must have the trait. ... Determine if the chart shows an autosomal or sex-linked (usually X-linked) trait. For example, in X-linked recessive traits, males are much more commonly affected than females.