Klinefelter's syndrome is a result of which of the following
nondisjunction mutations?
A. deletion of chromosome 5
B. only an X chromosome
C. two X chromosomes and a Y
D. three copies of the 21st chromosome

the correct answer is - ability to find a mate

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:

the backbone of the dna and rna compound is sugar phosphate.