In order to determine the expected average offspring length, what do you multiply with your heritability

Complete question:

In a population of toads, the average body length is 30mm. Body length is variable and the narrow sense heritability for body length is 0.1 for this population. You cross a male of 20mm with a female of 22mm. In order to determine the expected average offspring length, what do you multiply with your heritability?

The correct option is -9mm

In order to know the expected average offspring length, OABL, we need to multiply the selection differential, SD ( -9mm) with narrow-sense heritability, h² (0.1).

Explanation:

Available data:

To answer this question, we need to remember how can we calculate the selection differential and the heritability in the narrow sense.

SD = (20mm + 22mm)/2 - 30mm

SD = 21 mm - 30mm

SD = - 9mm

h² = body lengths of the offspring average/selection differential

But we already know the value of h². And we want to know the body length of the offspring. So we just need to clear the following equation.

OABL = ABDL + h² ( PABL - ABL)

where,

OABL = ABDL + h² ( PABL - ABL)

OABL = ABDL + h² ( SD)

OABL = 30mm + 0.1 ( -9mm)

OABL = 30mm + (-0.9 mm)

OABL = 21 mm

In order to know the expected average offspring length, OABL, we need to multiply the selection differential, SD ( -9mm) with narrow-sense heritability, h² (0.1).  

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explanation:

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