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In smileys, the shape of the eye is controlled by multiple alleles, much like blood types. The smileys picture shows the four possible phenotypes.

Which of the following is controlled by multiple alleles?

1) Ears on a phenotype
2) The shape of a phenotype's mouth
3) The shape of a phenotype's eye
4) The shape of a phenotype's nose

Answer :

Final answer:

The shape of the phenotype traits like the eyes, ears, mouth, and nose of smileys is explained by the concept of multiple alleles. In a population, a single gene can have more than two alleles, like the ABO blood type system in humans. However, an individual can only have two of these alleles, with traits determined by the combination of alleles from both parents.

Explanation:

In genetics, the shape of the phenotype traits like the eyes, ears, mouth, and nose of smileys is explained by the concept of multiple alleles. The principle of multiple alleles suggests that in a population, a single gene can have more than two alleles. For instance, the ABO blood type system in humans has three alleles designated IA, IB, and i.

However, any individual can only have two of these alleles at most, representing one from each parent. This is much like the smiley analogy described in your question. Phenotype traits like a cleft chin or a smooth chin are determined by a combination of these alleles from both parents, resulting in individuals having a homozygous or a heterozygous combination.

In traits governed by multiple genes, like the color of human eyes, each gene contributes to the overall phenotype, creating a wide range of possible traits. Thus, the phenotypes you described in smileys can also be determined by multiple alleles, and the eye's shape, like human eye color, can depend on the contribution of several genes.

Learn more about Multiple Alleles here:

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