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A normal couple has seven children (2 da...

A normal couple has seven children (2 daughter and 5 sons) .Three of the sons and none of the daughters is affected . Which is the inheritance type?

A

Sex limited recesive

B

Autosomal dominanat

C

Sex linke dominant

D

Sex linked recessive

Text Solution

AI Generated Solution

The correct Answer is:
To determine the type of inheritance in the given scenario, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Family Structure**: - The couple has seven children: 5 sons and 2 daughters. - Out of the 5 sons, 3 are affected by a certain condition, while both daughters are unaffected. 2. **Draw a Pedigree Chart**: - Represent the couple as a square (male) and a circle (female). - Draw lines to show their marriage and then represent their children. Use squares for sons and circles for daughters. - Mark the affected sons (3 out of 5) and the unaffected daughters (2). 3. **Analyze the Affected Individuals**: - Since only the sons are affected and none of the daughters are affected, this suggests that the condition is likely linked to the sex chromosomes. 4. **Consider the Inheritance Patterns**: - The condition cannot be autosomal dominant because if it were, at least one parent would have to be affected. - It cannot be autosomal recessive either, as this would typically show affected daughters if both parents were carriers. 5. **Evaluate Sex-Linked Inheritance**: - The affected individuals are all males, which suggests a sex-linked trait. - Since the daughters are unaffected, this indicates that they did not inherit the affected allele from their parents. 6. **Determine the Type of Sex-Linked Inheritance**: - The condition is likely to be sex-linked recessive. This means that the affected males have inherited the affected allele from their mother (who is a carrier) and the unaffected daughters have inherited normal alleles from both parents. 7. **Conclusion**: - Based on the analysis, the inheritance type is sex-linked recessive. ### Final Answer: The inheritance type is **sex-linked recessive**. ---
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