The observable expression of the genes present in an organism is called its

The observable expression of the genes present in an organism is called its... Phenotype.

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Step-by-step explanation:

The product of an even integer and an odd integer is even. Assume a is even and b is odd, so there exists an integer p so that a=2p and there exists an integer q so that b=2q+1. If a⋅b is even then by definition of even there exists an integer r such that a⋅b=2r.