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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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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?
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
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
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