The pedigree below shows the inheritance of red-green colorblindness, an X-linked recessive trait (XD = normal vision, Xd = colorblindness allele). For all of the questions below, assume that there is no abnormal event or new mutation: also, ignore X-inactivation for this problem. (a) Below each individual (except III-1), write out their genotype for color vision. Use -r to indicate any allele about which you are uncertain. (b) What is the probability that III-1 will be colorblind? Explain your reasoning to show how you arrived at you answer. (c) Using long and short chromosomes for the X and V. respectively, diagram the sex chromosomes as they would appear in a proper meta-phase I of meiosis in individual 11-3 of the pedigree above. Be sure to mark the color-vision locus where you think it could be located.

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I II III 1 1 2 2 ? 1 +Genotype 3 I II III 1 1 2 2 ? 1 +Genotype 3

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X linked recessive inheritance gets observed in males While the females are ca... View the full answer