whats contain in there germ cell that make it morphologically similar and physiologically different?

Dear student,
The question you have posted seems to be incomplete. But assuming the question to be related to isogamy, I have provided the answer below:

In isogamy, the gametes cannot be classified as male or female as they are similar in shape and size. Their morphology is the same as they develop through the process of mitosis. The products of mitosis do not develop a cell wall and end up becoming gametes. 

If you had something else on your mind, do get back to us.
Regards.
 

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