In the case of X-linked diseases, males who possess the gene for an unhealthy trait are:
A
Affected
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B
Carriers
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C
Normal
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D
Either A or B
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Solution
The correct option is A
Affected
Sex linked disorders can be linked to either the X chromosome or the Y chromosome. X-linked disorders are those disorders of the X-chromosome. Since males have a single X-chromosome, if they have the defective gene, they will be affected as they do not have a healthy copy of the gene (healthy allele) to mask the defective allele. However, females having one copy of the defective gene on X-chromosome become carriers since they have a healthy copy of the gene to mask it.