Question

How many among the sixteen offsprings produced in the F2 generation will have parental combinations of two genes controlling wheat kernel colour?

• A. Three
• B. Four
• C. One
• D. Two

Hint:

In genetics, parental combinations refer to the allele combinations inherited without recombination. In a typical dihybrid cross, two parental combinations will appear in the offspring.

Answer 1

The Correct Option is D

Step 1: Understanding the genetics.
The question refers to the inheritance of two genes controlling wheat kernel colour. The F2 generation typically results from a dihybrid cross, where the genes segregate independently, leading to four possible combinations of alleles. The question asks about the parental combinations, which are those combinations that involve no recombination. In a typical dihybrid cross, the parental combinations occur in 2 out of the 16 total offspring.
Step 2: Analyzing the options.
(A) Three: This is incorrect because parental combinations are less frequent in this case, occurring only in two of the offspring.
(B) Four: Incorrect. Although four combinations are possible, only two represent the parental combinations.
(C) One: Incorrect. The parental combinations occur more frequently than just one.
(D) Two: Correct. Parental combinations of the two genes appear in two offspring in a typical F2 generation.
Step 3: Conclusion.
The correct answer is (D) Two, as only two offspring typically have the parental gene combinations in a dihybrid cross.