imagine a chromosome that has alleles ""r"" and ""g"" on it. the homologous chromosome has different versions of these genes and contains the ""r"" and ""g"" versions. what are the possible gamete combinations that can occur?

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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explanation:

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a and c are the answeres