Mendel crossed Y/Y;R/R (yellow wrinkled)peas with y/y;r/r (green smooth)peas and selfed the F₁ to obtain an F₂.In the F₂ what proportion of the yellow wrinkled individuals were pure-breeding?

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In the initial cross, Y/Y;R/R x y/y;r/r, all offspring will be heterozygous for both traits (YyRr). When selfed, the F₁ will produce offspring in a 9:3:3:1 ratio (9 Y_R_, 3 Y_rr, 3 yyR_, 1 yyrr). In the F₂, only the Y_R_ individuals could be pure-breeding (YYRR, YYRr, YyRR, or YyRr). Since there are 9 Y_R_ individuals out of a total of 16, the proportion of pure-breeding yellow wrinkled individuals would be 1/9.

Mendel Crossed Y/Y;R/R (Yellow Wrinkled)peas with Y/y;r/r (Green Smooth)peas and Selfed