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Questions and Answers
What is the primary purpose of geneticists collecting information about a family's traits and disorders?
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?
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?
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?
Why can unaffected parents have an affected child?
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What type of information can be examined using a pedigree?
What type of information can be examined using a pedigree?
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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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