What is the key to the recognition of codominance? the alleles affect more than one trait. the heterozygote expresses the phenotype of both homozygotes. the trait exhibits a continuous distribution. the phenotype of the heterozygote falls between the phenotypes of the homozygotes. the dominant allele is not always expressed.

The heterozygote expresses the phenotype of both homozygotes.

The reason is codominance occurs when neither of the alleles has dominance over the other one and so both alleles are expressed.  The key to the recognition of codominance is recognizing that the heterozygote is expressing both of the homozygous alleles.  To determine this, first you must know what the homozygous alleles are.  Let's say that a cow has the allele for red hair and the allele for white hair.  A homozygous red hair cow would have red hair. A homozygous white hair cow would have white hair.  If the cow is heterozygous and it has both red and white hair, then the cow is exhibiting codominance.  Neither the allele for red hair nor the allele for white hair has dominance over the other, and both are expressed. A form of dominance in which the alleles of a gene pair in a heterozygote are fully expressed thereby  resulting in offspring with a phenotype that is neither dominant nor recessive.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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