Figure 6.

Mean pure-strain (black bars) and hybrid (shaded bars) brood sizes. Mean pure-strain is the midparent value. Numbers above the bars indicate heterosis values. Asterisks indicate significance of difference between pure-strains and hybrids in a Student's t test. ***P < 0.001.

Click et al. BMC Evolutionary Biology 2009 9:75   doi:10.1186/1471-2148-9-75
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