Question

In a crop, genes 'C' and 'P' are required for the development of color in the flowers. The white flowers are produced in the absence of either or both the genes. What will be the percentage of colored flowers in the off-springs of the cross CcPP × ccPp?

• A. 50%
• B. 25%
• C. 75%
• D. 100%

Hint:

Gene interaction:
- Complementary genes: Both genes needed for phenotype.
- Probability = Product of individual probabilities.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of gene interaction and probability.

Step 2: Key Formula or Approach:
Color requires both C and P.
If either C or P is absent, flowers are white.
We need to find the probability of offspring with both C and P.

Step 3: Detailed Explanation:
Cross: CcPP × ccPp
For gene C: Cc × cc → offspring: Cc (1/2), cc (1/2).
For gene P: PP × Pp → offspring: PP (1/2), Pp (1/2). All offspring have at least one P (since P is dominant).
For colored flowers, need: C_ (at least one C) and P_ (at least one P).
- Probability of C_ = 1/2.
- Probability of P_ = 1 (since all offspring have P).
Total probability of colored flowers = \(1/2 \times 1 = 1/2 = 50\%\).
Thus, 50% of the offspring will have colored flowers.

Step 4: Final Answer:
Thus, the percentage of colored flowers is 50%, which corresponds to option (A).
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