Central Texas College Tracing Color Blindness Pedigree Paper

1. Family History: Roberto is color blind. Both of Roberto’s parents are color blind. Roberto also has a brother and a sister, but neither have been tested for the color blindness phenotype. Roberto’s wife Linda has full color vision. Both of Linda’s parents have full color vision. Linda’s maternal grandfather (her mother’s father) has full color vision, while her maternal grandmother (her mother’s mother) is color blind. Linda’s fraternal grandfather (her father’s father) is color blind, while her fraternal grandmother (her father’s mother) has full color vision.

1.Draw or attach a photo of the pedigree you constructed tracing the color blindness allele based on the family information provided. Your pedigree must include a list of the genotypes next to each individual in the pedigree and a key identifying which allele is represented by the capital and lower case letters.

2.Based on the pedigree you constructed and information provided, explain the inheritance pattern for this trait. Be sure to identify whether the trait is autosomal or sex-linked, and dominant or recessive, and then explain how you identified the inheritance pattern.

3.What is the probability that Roberto’s brother will test positive for color blindness? What is the probability that his sister will test positive for color blindness? How did you determine these?

4.What is the probability that Linda carries the color blind allele? How did you determine this?

5.If Roberto and Linda have children, what is the likelihood (in percent) that a SON will exhibit color blindness? How did you determine this?

6.If Roberto and Linda have children, what is the likelihood (in percent) that a DAUGHTER will exhibit color blindness? How did you determine this?

2. Create a pedigree based on your own family

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