Researchers decide to selectively breed mice for the ability to more quickly fin

Question

Researchers decide to selectively breed mice for the ability to more quickly find their way out of a maze. The initial population of mice is able to complete the maze in a mean time of 47 seconds, with a standard deviation of 8 seconds. Parents with a mean time and standard deviation of 29 and 4 seconds, respectively, are chosen to mate. Their offspring complete the maze with a mean time and standard deviation of 40 and 7 seconds, respectively.

A) What is the narrow-sense heritability for this trait?

B) If this breeding is repeated for 25 generations until there are only very small improvements in completion times each new generation, would the phenotypic variance due to genetic variance be higher, lower, or the same as is was in the first generation of selection? Briefly explain

Explanation / Answer

narrow sense herotability h is VA/Vd additive variance/ dominant variance.

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