What is the approximate heritability of body length for: A) population 1 B) popu

Question

What is the approximate heritability of body length for: A) population 1 B) population 2
What factors might contribute to the difference in heritability of body size between the 2 populations of insects in the question above
For the populations shown in the figure above, if larger body size confers a survival advantage in this species, which population would be more likely to show evolutionary change over time? Explain. 18 14 10 100 18 16 14 12 Mid parent body length (mm) Population 1 Population 2

Explanation / Answer

(1) The approximate heritability of body length for: population 1 is 19 mm and for population 2 is 15 mm

(2) The factors that contribute to the difference in heritability of body size include: diet, female fecundity and male mating success.

The parental early nutrition (poor vs. standard) contribute to the difference in the heritability of body size. A study shows that the female (parent) raised on poor diet produced larger offspring than females that were raised on standard diet and males raised on poor diet sired larger sons than males that were raised on standard diet. The females raised on a poor diet produced larger offspring than females that were raised on a standard diet.

(3) if larger body size confers a survival advantage in this species, then the population 1 is more likely to show evolutionary change over time. The female fecundity advantage model depends on the clutch size and increases with female body size. The larger females will have more copies of their own genes in succeeding generations than the smaller females, resulting in genes for large body. The body size is evolutionarily labile and responds rapidly to natural and artificial selection.

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