Tall plant with yellow seeds (TtYy) is crossed with tall plant with green seeds (Ttyy). Find out proportions of offspring in F$_1$ generation:
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Solve Dihybrid crosses by breaking them down into two Monohybrid crosses. It is faster and less prone to error than drawing a large Punnett square (which would be $4 \times 2 = 8$ squares here).