A property professional with nearly 20 years experience of estate agency in Suffolk and North Essex. During that time I have carried out market appraisals on over 5000 residential properties and have helped over 1500 people successfully sell their home.
Therefore, a son from a color-blind mother (who receives the trait from his mother on the X-chromosome) will always be color-blind, regardless of the state of the father (who can only give his son a Y-chromosome).
1. A boy, whose parents and grandparents had normal vision, is color-blind. What are the genotypes for his mother and his maternal grandparents. Use XB for the dominant normal condition and Xb for the recessive, color-blind phenotype. Mother: XBXB XBXb XbXb Grandmother: XBXB XBXb XbXb Grandfather: XBY XbY 2. The bison herd on Konza Prairie has begun to show a genetic defect.