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