Select the incorrect statement.
- AMale fruit fly is heterogametic
- BIn male grasshoppers 50% of sperms have no sex-chromosome
- CIn domesticated fowls, sex of progeny depends on the type of sperm rather than egg
- DHuman males have one of their sex-chromosome much shorter than the other
Solution & Step-by-step Explanation
[Image showing sex determination in birds: ZW-ZZ system]
(A) True: Drosophila males are XY (heterogametic).
(B) True: Grasshopper males are XO; half the sperms have X, half have none.
(C) False: In fowls/birds, sex determination is ZW-ZZ. Females are ZW (heterogametic), so sex depends on the egg, not the sperm.
(D) True: X is large, Y is much shorter.
(A) True: Drosophila males are XY (heterogametic).
(B) True: Grasshopper males are XO; half the sperms have X, half have none.
(C) False: In fowls/birds, sex determination is ZW-ZZ. Females are ZW (heterogametic), so sex depends on the egg, not the sperm.
(D) True: X is large, Y is much shorter.