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Solution


Q.

Select the incorrect statement.               [2019]
1 Human males have one of their sex-chromosome much shorter than other.  
2 Male fruit fly is heterogametic.  
3 In male grasshoppers, 50% of sperms have no sex-chromosome.  
4 In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.  

Ans.

(4)

In birds, e.g., fowls, males have homomorphic sex chromosomes (AA + ZZ) and females have heteromorphic sex chromosomes (AA + ZW). So, males produce only one type of sperms containing (A + Z) whereas females produce two types of eggs (A + Z and A + W). Therefore, the sex of the progeny depends on the type of the egg which is fertilised by the sperm.