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How do I identify a pedigree?

Asked by William Peterson on September 11, 2021

Categories: Science Genetics


Rating: 4.7/5 (71 votes)

Reading a pedigree

  1. Determine whether the trait is dominant or recessive. If the trait is dominant, one of the parents must have the trait.
  2. 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.

Can you have twins if they don't run in your family? The chances of a woman having identical twins are about the same for everyone, as identical twins do not tend to run in families. This is because identical twins come from a single fertilized egg splitting in two and this is a random, rare event. Fraternal twins, on the other hand, can be-genetic.

Why is a pedigree important? Pedigree analysis is therefore an important tool in both basic research and genetic counseling. Each pedigree chart represents all of the available information about the inheritance of a single trait (most often a disease) within afamily.

Do twins come from Mom or Dad? However, fraternal twins, the type born of two separate fertilized eggs, are genetic. According to Stanford, the likelihood of twins during any particular pregnancy comes from the mother, because, as they put it, "A father's genes can't make a woman release two eggs."