Teaching UPTET 2023 (Paper 1 & 2) Mock Test General Science Biology Human body

_____ (X) twins in human beings are formed when ______ (Y) egg/eggs is/are fertilized by _________ (Z) sperm/sperms.

X, Y, Z respectively are : 

1
Identical, one, one 
2
Identical, two, one 
3
Fraternal, one, one 
4
Fraternal, one, two 
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