Question #6423570Single Choice

Biology

Question

In a particular species of fruit fly, the eye shape is determined by a gene with three alleles (E1, E2, E3). When a fly has the genotype E1E2, the eye shape is oval. But when it has the genotype E2E3, the eye shape is round, which is not what would be expected based on a simple two-factor model. This is an exception because:

Options

The presence of three alleles instead of two leads to more complex genetic combinations.

The alleles are not showing the typical dominant-recessive relationship.

There must be other genes interacting with the eye shape gene.

The genetic code for eye shape is more variable than assumed.

Answer & Analysis

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