Sex chromosomes present in female are _________?
Correct answer: B. XX
- A. XY
- B. XX
- C. XXY
- D. XXX
Explanation
In the usual human chromosome pattern, females have two X sex chromosomes, written XX, while males have XY. Students may choose XY because it is the other common human sex-chromosome combination, but XY describes a typical male rather than a female.
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About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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