A dichotomous key is used to and you always start with ? Help you find your way through an unknown area; #1

Help you identify an unknown organism; #2

Help you solve a riddle; #2

Help you identify an unknown organism; #1

In a certain plant, yellow leaves are dominant (y) and red leaves are recessive (y). a plant with genotype yy and a plant with yy are crossed. if they have four offspring, how many would you predict would have red leaves? a: 1b: 0c: 3d: 2