Test: GRE Subject Test: Biochemistry, Cell, and Molecular Biology

1.

In a species of ant, black coloration is dominant to white. A scientist is operating under the assumption that this gene follows basic Mendelian principles; however, after crossing two heterozygotes he obtained a ratio of 2:1 of dominant to recessive offspring. Which of the following could explain this result?

The alleles display codominance 

The homozygous dominant phenotype is lethal

The alleles display incomplete dominance

The homozygous recessive phenotype is lethal

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