This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Boys are more likely to be affected by which genetic disorders ? 
Select and explain. 
A. AD, B. AR, C. X linked dominant, D. X linked recessive
D: X linked recessive
Answer: D: X linked recessive 
Explanation: Ans. is 'd' i.e., X linked recessive X-linked disorders Except for a few conditions, all X-linked disorders are X-linked recessive. As male has only one X-chromosome, the male with affected gene on X-chromosome will always manifest the disease. On the other hand, female has 2 X-chromosomes, heterozyogous female will be carrier because of expression of normal allel on the other X-chromosome. So a boy has more probability to manifest X linked recessive as compared to girls