Genetic Disorders and Pedigree Analysis

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Questions and Answers

What is the primary purpose of geneticists collecting information about a family's traits and disorders?

To help couples and families

What type of chart is used to show the inheritance pattern of traits in a family over many generations?

A pedigree

What is the term for an individual who carries a recessive allele but does not express it?

Heterozygous

Why can unaffected parents have an affected child?

<p>Because both parents are carriers (heterozygous)</p> Signup and view all the answers

What type of information can be examined using a pedigree?

<p>The inheritance pattern of traits and certain disorders</p> Signup and view all the answers

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Study Notes

Geneticists' Tools

  • Geneticists collect information to help couples and families.
  • One tool used is a pedigree, a flowchart that shows the inheritance pattern of traits in a family over many generations.

Pedigree Analysis

  • Pedigrees can be used to trace traits such as curly hair, straight hair, and freckles over generations in a family.
  • They can also be used to examine certain disorders that can occur over generations.

Inheritance of Disorders

  • Unaffected parents can have an affected child if both parents are carriers (heterozygous) of a recessive allele.
  • Carriers do not express the recessive allele, so they are not affected.

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