The credit for discovery of the structure of dna was given to and . the shape of the dna molecule is described as a . after replication, identical molecule of are produced. a gene is a sequence of in a dna molecule

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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