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Fig. 2. Temperatures at inflection point (50% sterile males) in parents,
F1, F2 (white circle) and of successive backcrosses (see
Table 2). (A) The Y chromosome
of Delhi is introduced into the Prunay background. (B) The Y chromosome of
Prunay is introduced into the Delhi background. Horizontal arrows in each
graph show the temperatures at inflection point of the two parental lines:
Delhi (top) and Prunay (bottom). From G3 to G6, values
are not different and the mean is illustrated by a dotted line. The respective
roles of Y and genetic background are indicated.