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Scientists measured the mean number of different alleles per gene in three populations of the same plant species. The results, with standard deviations, are shown in the table.
| Population | Mean number of alleles per gene | Standard deviation |
|---|---|---|
| X | 12.0 | 1.2 |
| Y | 18.0 | 1.5 |
| Z | 13.0 | 4.0 |
Identify the population with the greatest genetic diversity.
A student concluded that population Z has greater genetic diversity than population X. Using the standard deviations, explain why this conclusion may not be valid.