Carriers of certain genetic characteristics can pass that characteristic on only if

Question

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In order for a carrier to pass on a genetic characteristic, the other parent must also have a recessive gene for the same characteristic. This is because the carrier only possesses one copy of the gene, which is not enough to express the characteristic, but if they pass on the recessive gene to their offspring and the other parent also contributes a recessive gene, then the characteristic will be expressed in the offspring.

Carriers of Certain Genetic Characteristics Can Pass That Characteristic on Only