A monohybrid cross might not result in the expected phenotype due to the presence of the dominant and recessive allele.
This is the type of cross which exists between heterozygous parents of the same trait and we are ware of the presence of the dominant and recessive traits in them.
This is why when the parents are crossed, the dominant or recessive traits may be expressed in the offspring. This is therefore the reason why a monohybrid cross not result in the expected phenotypes and is therefore the most appropriate choice.
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