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  4. Sex determination by chromosomal difference in man and Drosophila is by mechanism called

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Q. Sex determination by chromosomal difference in man and Drosophila is by mechanism called

AMUAMU 2014Principles of Inheritance and Variation

Solution:

In humans and in Drosophila the males have one $X$ and one $Y$-chromosome, whereas female have a pair of $X$-chromosomes besides autosomes. In birds. $ZZ-ZW$ mechanisms and in grasshopper, sex determination mechanism is $XX-XO$ type.