Mendelian Disorders
Easybiology
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by:
Select the correct option:
Solution
Incorrect! Answer:
Both sons and daughters
- Genotype of Mother: Since the condition is X-linked, the mother has two X chromosomes (XAX).
- Inheritance to Sons: A son receives his only X chromosome from his mother (Y comes from the father). Thus, he can inherit the XA chromosome.
- Inheritance to Daughters: A daughter receives one X chromosome from each parent. She can receive the XA chromosome from her mother.
- Conclusion: Both sons and daughters have a 50% chance of receiving the specific X chromosome from their mother.
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About This Question
- Subject
- biology
- Chapter
- principles of inheritance and variation
- Topic
- mendelian disorders
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Both sons and daughters
- Genotype of Mother: Since the condition is X-linked, the mother has two X chromosomes (XAX).
- Inheritance to Sons: A son receives his only X chromosome from his mother (Y comes from the father). Thus, he can inherit the XA chromosome.
- Inheritance to Daughters: A daughter receives one X chromosome from each parent. She can receive the XA chromosome from her mother.
- Conclusion: Both sons and daughters have a 50% chance of receiving the specific X chromosome from their mother.
This easy difficulty biology question is from the chapter principles of inheritance and variation, covering the topic of mendelian disorders. It appeared in the 2025 exam.
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