Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Principles of Inheritance and Variation

Question:

In a garden pea, the axial flower is dominant to terminal flower. What will be the percentage of offsprings with terminal flowers, when two heterozygous plants are crossed?

Options:

25%

50%

75%

0%

Correct Answer:

25%

Explanation:

The correct answer is Option (1) -25%

If axial (A) flower is dominant to terminal (a) flower, and both parents are heterozygous (Aa), the Punnett square for the cross would look like this:

 

In this Punnett square, there are four possible combinations of alleles in the offspring:

  • AA (axial flower)
  • Aa (axial flower)
  • Aa (axial flower)
  • aa (terminal flower)

Out of these four combinations, 3 out of 4 (or 75%) have the possibility of producing axial flowers, while 1 out of 4 (or 25%) has the possibility of producing terminal flowers.

So, the correct answer is (1) 25%.