Why can’t a gamete carry an ""hh"" instead of an ""hs"" or an ""Hh"" instead of a ""HS?

HS and hs is more suitable because during reproduction, gametes fuse with another gamete and the sets of alleles from both combines which results in the standard diploidy requirement for growth of an organism.

Supposing the gametes were diploid, the two gametes will fuse to form a zygote which is tetraploidy. This brings about abnormalities most of the time in organisms which don’t support this ploidy system.

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