How many purple beans would result from a cross between two purple beans?

A cross between red bean (RR) and a blue bean (UU) yields all purple beans.

How many purple beans would result from a cross between two purple beans?
A . 0.25 of the offspring
B . 0.50 of the offspring
C . 0.75 of the offspring
D . all of the offspring

View Answer

Answer: B

Explanation:

Begin by crossing a red bean with a blue bean: RR × UU gives all RU, also known as incomplete dominance. Next cross a purple bean with a purple bean: RU × RU yields 1 RR, 2 RU and 1 UU. Two out of the four offspring are purple beans. This is the same as 0.50, or 50%.