In a population of lizards, some have tails that are all red (RR), and some have tails that are all blue (BB). The offspring of a red-tailed lizard and a blue-tailed lizard have tails that are both red and blue.

Question

What type of inheritance does this demonstrate?

incomplete dominance
codominance
dominant recessive
homozygous

Answer 1

The inheritance pattern demonstrated in this scenario is codominance. In codominance, both alleles are expressed equally in the phenotype of the offspring. In this case, the offspring of a red-tailed lizard (RR) and a blue-tailed lizard (BB) show tails that are both red and blue, indicating that both traits are fully expressed together.