Question

Which one of the following crosses shows phenotypic ration of 3 : 1?

• A. $AaBb\times AaBb$
• B. $aabb\times AABb$
• C. $Aabb\times Aabb$
• D. $AaBb\times aabb$

Answer 1

The correct option is C $Aabb\times Aabb$

To get 3 : 1 ratio (i.e,) 3 + 1 = 4 zygotes, either both parents should produce 2 gametes each or one parent should produce 4 and other 1 gamete.