The pattern of sex determination in which the female is heterogametic is found in:
Correct answer: C. Butterflies
- A. Protenor bugs
- B. Grasshoppers
- C. Butterflies
- D. Fruit flies
Explanation
The correct answer is butterflies. In the ZW sex-determination system, which is observed in butterflies, moths, and birds, the female is heterogametic (ZW) and the male is homogametic (ZZ). This contrasts with the XY system in humans and fruit flies where the male is heterogametic. Protenor bugs and grasshoppers use the XO system, which involves different mechanisms of sex determination.
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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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