Question

How do I do a test cross between these?
Ccbb x CcB_
Thank you so much!

Answer 1

use the forked line method, like cross Cc and Cc and then cross the bb and B- and then join them ka forked line method....

Answer 2

Or use a Punnet Square:


On square I is the Homozygous traits, and on square II is the Heterozygous.