Figure 5.

Fitness frequencies of the df-carrying hybrids in mel/sim hybrids at two different temperatures. (A) mel/sim 18°. (B) mel/sim 24°. Black solid lines in each panel show the mean fitness of the df-carrying hybrids. Black dashed lines show the average ± SD from the mean. The x-axis shows relative viability of deficiency-carrying progeny (observed df-carrying progeny/observed Bal-carrying progeny + observed df-carrying progeny) while the y-axis shows the number of stocks having a given level of viability of deficiency carrying offspring. Bal, balancer chromosome; df, deficiencies; mel, D. melanogaster; sim, D. simulans.