Which one is a sex-limited trait?
Correct answer: D. Tfm
- A. Beard growth
- B. Baldness
- C. Haemophilia
- D. Tfm
Explanation
Testicular feminization, also known as androgen insensitivity syndrome (AIS), is a genetic condition in which individuals with XY chromosomes are resistant to the effects of androgens, such as testosterone. As a result, affected individuals are born with external female genitalia despite having male chromosomes. This condition is caused by mutations in the gene encoding the androgen receptor (AR) located on the X chromosome. Because the condition only affects individuals with a Y chromosome, it is considered a sex-limited trait.
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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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