Understanding Trihybrid Cross

Trihybrid Cross

Parent: AaBbDd x AaBbDd

 

To get gametes:

-     - Write 4 A, 4 a in 2 rows

-     - Fill in B B b b in each row

-     - Fill in D d D d in each row

 

ABD ABd AbD Abd

aBD aBd abD abd

 

To get F2 generations:

-     - Do Punnett square

-     - Then find Dominant in all

-     - Dominant in all except recessive a

-     - Dominant in all except recessive b

-     - Identify all of the unique phenotypes

-     - The ratio should be 27: 9: 9: 9: 3: 3: 3: 1