This produced wet season and dry season lines (i.e., High
and Low) with highly divergent patterns of response to rearing
temperature (Fig. 2A). Wing patterns in butterflies from the
wet season line are wet season form at all rearing temperatures,
although eyespot size still increases strongly with
temperature. The dry season line after selection at progressively
higher temperatures now produces only dry season
form butterflies (and the reduction in phenotypic plasticity in
this line is probably due to the inability of eyespots and medial
band to be smaller than zero!). Analysis of the variation in
eyespot size found in crosses between the lines suggests
that they differ in at least five or six genes.(