DescriptionCritique of the Theory of Evolution Fig 066.jpg
Fig. 66. Cross between black vestigial and gray long flies. Two pairs of factors involved in the second group. The F1 female is back crossed (to right) to black vestigial male; and the F1 male is back crossed to black vestigial female (to left). Crossing over takes place in the F1 female but not in the F1 male.
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{{Information |Description=Fig. 66. Cross between black vestigial and gray long flies. Two pairs of factors involved in the second group. The F1 female is back crossed (to right) to black vestigial male; and the F1 male is back crossed to black vestigial