In snapdragon plants, broad leaf is a completely dominant to narrow leaf whereas red flower colour is incompletely dominant to ivory.(The genes for leaf width and flower colour are not linked.)
If a plant which is heterozygous for both genes is crossed with a true-breeding broad-leaved red-flowered plant, then the expected proportion of broad-leaved plants with pink flowers amongst the offspring would be _____
a. 2 in 4
b. 4 in 4
c. 1 in 4
d. 3 in 4