Table of Contents
How can a pedigree trace a trait through generations?
Reading a pedigree By analyzing a pedigree, we can determine genotypes, identify phenotypes, and predict how a trait will be passed on in the future. The information from a pedigree makes it possible to determine how certain alleles are inherited: whether they are dominant, recessive, autosomal, or sex-linked.
How do you indicate if someone has a trait on a pedigree?
In this family pedigree, black squares indicate the presence of a particular trait in a male, and white squares represent males without the trait. White circles are females. A trait in one generation can be inherited, but not outwardly apparent before two more generations (compare black squares).
What best describes the trait shown in the pedigree below?
The following pedigree illustrates the inheritance of Nance-Horan syndrome, a rare genetic condition in which affected persons have cataracts and abnormally shaped teeth. On the basis of this pedigree, what is the most likely mode of inheritance of Nance-Horan syndrome?
How do you find the generation of a pedigree?
As you add generations, label each generation using Roman numerals (I, II, III, and so on). The original set of parents, located at the top or far left, are generation I. Continue the sequential numbering to their children, grandchildren, great grandchildren and so forth.
How does a pedigree chart help track traits diseases in families?
Pedigree. A pedigree is a genetic representation of a family tree that diagrams the inheritance of a trait or disease though several generations. The pedigree shows the relationships between family members and indicates which individuals express or silently carry the trait in question.
What does a pedigree help scientists trace?
A pedigree is a chart which shows the inheritance of a trait over several generations. From studying a pedigree, scientists can determine if a trait is sex-linked or autosomal.
How do you explain a pedigree chart?
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.