Multicellular organisms such as humans could be thought of as populations of cells, where each member of the population is derived from a single ancestor: the zygote. In such populations, we would expect to see that ________
A) all of the cells of the population are genetically identical, since they are derived by mitosis from the zygote
B) mutations can occur, but only in cells that develop into tumors
C) mutations could occur in any cell, and if so, they may be still be capable of division, leading to cells with heritable genetic variation
D) mutation events that lead to increased cell survival or more rapid reproduction could, in effect, develop into tissues which evolve by natural selection within the organism
E) Both C and D are possible outcomes.
E
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