Name Date Class Colorblind Pedigree 11 b tracing

Name: Date: Class: Colorblind Pedigree 11 b tracing a genetic characteristic through a given pedigree. Directions: Assign each person in the pedigree with the appropriate genotypes. Use a different color for lowercase c to show the recessive allele. Determine which people are carriers and shade half their symbols. Those that are colorblind are already fully shaded. P F 1 F 2 F 3 A C B E D G F I H L K J M N O

Colorblind questions 1. What chromosome do fathers pass to their sons? 2. How many X chromosomes do girls get from their mothers? ____ 3. What will be true about all daughters of colorblind fathers and normal vision mothers (mothers that are not carriers)? _________________________________. 4. Why do boys have a greater chance to be colorblind than girls? __________________________________________________________________________________________________ 5. Why can’t a boy be a carrier of colorblindness? __________________________________________________________________________________________________ 6. Which chromosome carries the colorblindness gene? _____ X or Y