Two strains of true-breeding maize that both produce ears of corn with white ker

Question

Two strains of true-breeding maize that both produce ears of corn with white kernels are crossed and found to produce F1 plants that make all ears of corn with red kernels. If these F1 plants are backcrossed to one of the parents, what proportion of the offspring should have white kernels? (Considering a backcross to either parent will give you the same results.) (Enter your answer as a decimal with only one place after the decimal e.g. 0.1 or 0.2 Please note that NO points will be awarded if you fail to include the zero or other number before the decimal).

Explanation / Answer

Two pure breeding maize strains that produce white kernels when crossed produced red kernels. Since the parental strains are true breeding, there is a possibility that they have mutations in two different genes. Appearance of red color in F1 indicates that the white color is recessive.

So, the parental genotypes are aaBB and AAbb

F1 is AaBb

Backcross between aaBB and AaBb

So, half of offsprings produce red kernels and the other half produce white kernels. So, the proportion of offsprings with white kernels is 0.5.

aB aB aB aB AB AaBB AaBB AaBB AaBB Ab AaBb AaBb AaBb AaBb aB aaBb aaBB aaBB aaBB ab aaBb aaBb aaBb aaBb

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