What ratio of plants in the offspring would you predict from a Yy x Yy cross?

The correct answer is -

The genotype of offspring - 1:2:1 (YY:Yy:yy)

The phenotype of offspring - 3:1 (dominant trait: recessive trait)

Explanation:

In this question, it is stated that there is a cross between Yy and Yy. By the genotype of the parents, we can say that Y is dominant for a particular trait and y is recessive and the parents are in the heterozygous condition in this cross. The gametes these parents will produce are - Y and y and Y and y

then the cross of Yy and Yy would be -

      Y      y

Y    YY    Yy

y     Yy    yy

Offspring from this cross are YY, Yy, Yy, and yy which means the genotypic ratio is - 1:2:1 and the phenotypic ratio is - 3:1 as three out of four are dominant.

the answer to your question is b