I think you guys are only considering Mendelian inheritance..Mendelian inheritance is not followed in every traits ..There is something called non Mendelian inheritance.Genetics is not that linear...there is incomplete dominance ,co dominance, mitochondrial inheritance etc
"Mendel himself warned that care was needed in extrapolating his patterns to other organisms or traits. Indeed, many organisms have traits whose inheritance works differently from the principles he described; these traits are called non-Mendelian.[36][37]
For example, Mendel focused on traits whose genes have only two alleles, such as "A" and "a". However, many genes have more than two alleles. He also focused on traits determined by a single gene. But some traits, such as height, depend on many genes rather than just one. Traits dependent on multiple genes are called polygenic traits."
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