- The pedigree chart illustrates the inheritance of Hitchhiker's Thumb, a recessive trait.
- Individuals with the trait are represented by filled symbols, while those without it are shown as unfilled symbols.
- Heterozygous individuals are depicted with half-filled symbols.
- To determine genotypes, identify affected individuals (recessive homozygotes) and use Mendelian inheritance rules to deduce the genotypes of unaffected individuals based on their offspring or parents.
- For example, if two unaffected parents have an affected child, both parents must be heterozygous carriers.
- Analyze each generation systematically, starting from known genotypes (affected individuals) and working outward to infer unknown genotypes.
- Use the provided key to interpret symbols correctly: squares for males, circles for females, filled for affected, unfilled for unaffected, and half-filled for heterozygous.
Parent Tip: Review the logic above to help your child master the concept of pedigree worksheet biology.
