The DNA has to replicate during the S phase so that each new cell that is forming can get it's own replica of the original cell's DNA molecule
Answer:
The sex cells could not easily combine to form the body cells of an offspring because of the different chromosome number.
Explanation:
The correct answer is class.
Taxonomic category (rank) is the level of a group of organisms in a taxonomic hierarchy. The major ranks are domain, kingdom, phylum, class, order, family, genus, and species. Higher rank has more general characteristics of organisms. The lowest rank-species contains most specific descriptions of life forms in it.
Mutations result from an error in DNA replication, should it be from an alien source (like radiation) or simply a mistake in replication.
Migration of organisms to a new population would alter the DNA by adding new genes, but it would not mutate them.
