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the populations have an excess of heterozygotes
No The test statistic F-Test is a sum of squares, which by definition of squaring a number it must be positive.
The F distribution can't be negative.
The F statistic is statistic which may be used to test whether a regression accounts for a statistically significant proportion of the observed variation in the dependent variable.
A high F statistic would results in a lower Sig, or P value, which would indicate that your results are significant.