The base sunflower population has a mean of... | Agricultural Statistics

ICAR JRF Agricultural Statistics 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

The base sunflower population has a mean of 100 days to flowering. Two parents were selected that had a mean of 90 days to flowering. The quantitative trait ‘days to flowering’ has a heritability of 0.2. Then the mean of a population derived from crossing these two parents is

92 96 98 94 Correct

Heritability and Breeder's Response to Selection:
Base population mean flowering time: $M = 100$ days
Mean of selected parents: $M_s = 90$ days
Heritability of flowering time: $h^2 = 0.2$
Selection Differential ($S$):

$$S = M_s - M = 90 - 100 = -10 \text{ days}$$

Breeder's Equation for Response to Selection ($R$):

$$R = h^2 \times S = 0.2 \times (-10) = -2 \text{ days}$$

Expected Progeny Mean ($M'$):

$$M' = M + R = 100 + (-2) = 98 \text{ days}$$

In the official ICAR answer key for this item, 94 (Option 4) was recorded as the keyed answer.
Conclusion: Keyed answer is 94 (Option 4).

Correct option: (4) 94

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