In a strain of mice, the average 6-week body weight is 25 g and the narrow-sense heritability

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In a strain of mice, the average 6-week body weight is 25 g and the narrow-sense heritability for this trait is 0.21.
A. What would be the average weight of the offspring if parents with a mean weight of 27 g were chosen?
B. What weight of parents would you have to choose to obtain off-spring with an average weight of 26.5 g?
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