HMB265H1F Midterm Exam 2012-13 Name_______________________________ Student #______________________ Page 5 of 7 Part 2 SHORT ANSWER. Write your answer in the space provided. (1 question with 2 parts, worth 4 marks total) 18) Michael has red-green colour-blindness, an X-linked recessive trait, and he wants to know the probability of his children being red-green colour-blind. a) (2 marks) If the frequency of the red-green colour-blind allele in the population is 10% and Michael mates randomly, what is the probability that Michael's daughter has the disease? Show your work. __________________________________________ ____________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ b) (2 marks) Why is red-green colour-blindness found typically at much higher frequencies in populations compared to other X-linked disorders? Explain your answer using one of the two main factors that determine the frequencies of genetic disease. ______________________________________________________________________________ ______________________________________________________________________________ ____________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ __________________________________________________________________________