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Parthenogenesis is defined as:

"A type of asexual reproduction in which egg develops without fertilization to form a new individual."

If parthenogenesis takes place in bees, a drone or male bee is produced.

My question is that parthenogenesis is the development of EGG into new individual so, how can egg be developed into male because egg won't have that "Y" chromosome required for male offspring?

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up vote 3 down vote accepted

Because the "Y chromosome" has nothing to do with sex determination in bees. Instead, the number of X chromosomes determines the sex. With only one X chromosome, the egg will develop into a male. This is called a haplodiploid system of sex determination (the male bees are haploid, having only half the number of chromosomes).

EDIT: I should add that there are many systems of sex determination, not just XY or the haplodiploid system. See the Z-W system (males are ZZ and females are ZW), the X0 system (the males are diploid for all but the sex chromosome), and temperature-dependent system of sex determination.

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@MuhammadRafique: I have edited my answer to be slightly more accurate and provide additional information. – dd3 Apr 3 '13 at 22:13

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