

Hi there!
If there were 1 gamete with 'Y' and the other gamete with 'y' gene, then the resultant genotype on fusion will be 'Yy' only. Thus, there is only one possibility of genotype, i.e., Yy.
However, if the number of gametes are more, then there could be three possibilities - YY, Yy, yy.
Thanks
