How many different kinds of gametes are produced by the F₁ offspring from a cross between  pure strain of plants with yellow peas and a pure strain of plants with green peas ?

Number of gametes can be calculated by the formula - 2, n = number of heterozygous individuals.

If F₁ offspring is heterozygous, therefore one individual means 1 heterozygous, will produce 2 gametes.$\Rightarrow$  2 = 2¹ = 2 types of gametes. $\to$ Y and y.