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What is the pattern of inheritance for a...

What is the pattern of inheritance for a sex-linked allele ?

A

Every affected person has an affected parent

B

Unaffected parents cam produce children who are affected

C

Unaffected mothers have affected sons and daughters who are carriers

D

None of these

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Sex-Linked Alleles**: - Sex-linked alleles are genes located on the sex chromosomes (X and Y). In humans, the X chromosome carries many genes, while the Y chromosome carries fewer. Most sex-linked traits are associated with genes on the X chromosome. 2. **Analyzing the Options**: - **Option A**: "Every affected person has an affected parent." - This statement is not necessarily true for sex-linked traits. An affected male can have an unaffected mother, as males inherit their X chromosome from their mother. - **Option B**: "An unaffected parent can produce children who are affected." - This is also incorrect in the context of sex-linked inheritance. If a parent is unaffected, they cannot pass on the affected allele unless they are a carrier (which is not the case for males). - **Option C**: "Unaffected mothers have affected sons and daughters who are carriers." - This is a correct statement. An unaffected mother (XX) can have affected sons (XY) if the father is affected (X^aY), and the daughters can be carriers (X^aX) if they inherit the affected X from their father. - **Option D**: "None of these." - This option is incorrect since option C is a valid statement. 3. **Conclusion**: - The correct answer is **Option C**: "Unaffected mothers have affected sons and daughters who are carriers."
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