alleryIn humans, **sex chromosomes** are:
AXX in male, XY in female
BXY in male, XX in female
CZW in male, ZZ in female
DXO in male, XX in female
Answer & Solution
Correct answer: B. XY in male, XX in female
Humans (and other mammals) follow XY sex determination: females XX, males XY.
The Y chromosome carries the SRY gene that triggers male development.
(Birds use the ZW system, with females ZW.)
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