Your biology instructor has assigned you a lab exercise to test a hypothesis regarding the inheritance of stem length in pea plants.If your assignment is specifically to conduct a monohybrid cross for stem length from available genotypes growing in the lab,which of the following crosses should be performed?

Question

Quizplus · Accepted Answer

To conduct a monohybrid cross for stem length, we need to cross two individuals that are heterozygous (Tt) for the trait. Therefore, the best choice is to cross Tt with Tt. This will result in an offspring ratio of 3:1 for stem length, with three offspring having the dominant trait (T) for tall stems and one offspring having the recessive trait (t) for short stems. Crosses A, B, C, and E do not involve two heterozygous individuals and therefore would not result in a 3:1 offspring ratio for stem length.

Your Biology Instructor Has Assigned You a Lab Exercise to Test