What type of genetic inheritance would result in a child showing a trait if one parent carries only the recessive allele?

For a child to exhibit a trait that is determined by a recessive allele, at least one parent must contribute a recessive allele. If one parent carries only the recessive allele, it would mean that the other parent must possess a dominant allele that masks the expression of the recessive trait. In the case of complete dominance, the dominant allele would entirely overshadow the effects of the recessive allele in the phenotype unless the child inherits the recessive allele from both parents. Therefore, the presence of only a recessive allele in one parent does not lead to the child displaying the recessive trait unless the other parent also provides a recessive allele.

In situations involving incomplete dominance or codominance, traits can manifest in varying ways based on the combination of alleles. Incomplete dominance leads to an intermediate phenotype, and in codominance, both alleles are expressed. However, both of these scenarios also require the other parent to contribute alleles that will not allow for a single recessive allele inheritance to result in the expression of a recessive trait.

Consequently, none of the listed inheritance patterns will result in a child showing a trait with just one parent carrying a recessive allele alone. Hence, the correct conclusion is that the specified conditions lead