Discussion
In a hypothetical diploid animal species, there is a locus with two alleles A and B. If A and B are co-dominant, then how many different phenotypes are possible in this species ?
Answer: C
3 phenotypes are possible.
With two alleles at one locus there are three genotypes: AA, AB and BB. When the alleles are co-dominant, both are fully expressed in the heterozygote, so AB shows the products of both A and B and looks different from either homozygote. Each genotype therefore has its own phenotype:
\[ \text{AA},\ \text{AB},\ \text{BB}: 3\ \text{phenotypes} \]
Two phenotypes would be the result with complete dominance, where AB looks like one homozygote. Four would need a third allele or a second locus.
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