When two pink flowers (RW) are crossed, there are four equally likely possible outcomes for the genetic makeup of the offspring: red (RR), pink(RW), pink(WR), and white (WW). If two pink snapdragons are crossed, what is the probability that the offspring will be (a) pink, (b) red, and (c) white?

a) 50% chance of being pink

b) 25% chance of being red

c) 25% change of being white

Explanation:

Since neither the R allele or W allele is dominant over the other, this is codominance. If 2 pink ones are crossed, that means both of them are RW

If we draw out the punnet square

     R      W

R   RR   RW

W  RW  WW

There is a 1:2:1 ratio of Red to Pink to White

Therefore

a) 50% chance of being pink

b) 25% chance of being red

c) 25% change of being white

allowed for the prediction of the properties of missing elements.