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NEET BIOLOGYMedium

In animal kingdom, along with XX-YY mechanism, many other variants of chromosomal sex determination mechanisms have been described such as XX-XO mechanism, ZZ-ZW mechanism, ZZ-ZO mechanism and haplo-diploidy mechanism, which are present respectively in:

A

Birds, Grasshopper, Wasp, Moth

B

Grasshopper, Birds, Moth, Wasp

C

Birds, Moth, Grasshopper, Wasp

D

Grasshopper, Moth, Birds, Wasp

Step-by-Step Solution

:

  1. XX-XO mechanism: Found in insects like the Grasshopper, where males have only one X chromosome (XO) and females have a pair (XX) .
  2. ZZ-ZW mechanism: Found in Birds, where females have dissimilar chromosomes (ZW) and males have similar chromosomes (ZZ) .
  3. Haplo-diploidy mechanism: Found in insects like Honey bees (and Wasps), where males are haploid and females are diploid .
  4. ZZ-ZO mechanism: While not explicitly detailed in the text, by elimination and standard classification in this context, Moths fit the remaining slot (some Lepidoptera exhibit ZO mechanisms).
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