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Pedigrees

Students will analyze the inheritance of biological traits through successive generations using pedigrees. They will also learn about Mendel's laws and the role of meiosis in reproductive variability. Pedigrees provide a visual representation of family history and can be used to determine dominant alleles, heterozygosity, and sex-linkage. This Mini Lab activity in your biology textbook will further enhance understanding.

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Pedigrees

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  1. Pedigrees

  2. Standard: Students will analyze how biological traits are passed on to successive generations. • Element: Using Mendel’s laws, explain the role of meiosis in reproductive variability. • EQ: What is a pedigree?

  3. Pedigree • A family history that shows how a trait is inherited over several generations. • Females are represented by circles and males are represented by squares. • Male Female

  4. Horizontal lines connect parents • Vertical lines connect parents to their offspring (arranged from left to right in birth order). • Shading is used to represent individuals that have the trait • VerticalHorizontal

  5. Pedigrees are useful for showing the family history for a particular genetic disorder. A genetic disorder is any type of disease or condition that can be inherited. • Based on the pattern shown in a pedigree, it is possible to determine dominant alleles, whether or not a person is heterozygous, and if a trait is sex-linked • Check your understanding: answer the questions for the Mini Lab on page 300 in your biology textbook

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