We want to determine whether time to sexual maturity (egg laying) in octopus is

Question

We want to determine whether time to sexual maturity (egg laying) in octopus is a heritable trait. A population of 150 octopus takes an average time of 458 days to reach maturity. We select 20 octopuses that reached maturity earliest; their average time to adulthood is 365 days. We breed those 20 early-adult octopuses with each other and monitor the resulting offspring. We watch to see when they mature; the average time to maturity is 405 days. 12. Calculate the selection differential. (3 pts.) 13. Calculate the response to selection. (3 pts.) 14. Calculate heritability (h'). (3 pts.) 15. Interpret the heritability of maturity in octopus from above (3 pts.)

Explanation / Answer

12. selection differential is the difference between average time for sexual maturity of the population and average time for sexual maturity of the selected population= 365-458= -93 days

13 Response to selection is the difference between the mean of the offsprings of the selected parents (405) and mean of the general population(458)= 405-458 = -53 days

14. Heritability = response to selection/Selection differential = -53 / -93= 0.57

15. There is a 57% genetic input in the sexual maturity of octopus and rest 44% is enviornmental input.

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