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In another selection experiment, the average value of a trait in the starting population is 10 and the narrow-sense heritability of the trait is 0.5. To get progeny with an average value of 12, what would the average value of the trait in the selected breeders need to be?

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Irving Heathcote
Irving HeathcoteLv2
28 Sep 2019

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Related questions

A population of birds has an average tarsus (part of the leg) length of 20 mm. The successful breeders in this population have an average tarsus length of 25 mm.

What is the selection differential?

If the narrow sense heritability tarsus length was 1.0, what would the average tarsus length of the offspring be?

If the narrow sense heritability of tarsus length was .5, what would the average tarsus length of the offspring be?

12. Imagine a population of captive giant tortoises housed at the Charles Darwin Research Station. The captive breeders are attempting to increase body-size and select for saddle-shaped shells in response to ecotourism demands for giant tortoise rides. A parental population of giant tortoises had an average body mass of 250 kg. The captive breeders selected 10 males and 10 females from the general population that had an average body mass of 275 kg. Following this round of mating, the surviving offspring were an average of 260 kg when full grown.

a. Calculate the narrow sense heritability (h2) for body size in this population of giant tortoises

b. If the breeders select 20 of the smallest adult individuals from the general population that have an average body mass of 200 kg, what will be the expected average body mass of their offspring? Assume that the narrow sense heritability stays the same.

A study investigated the vitamin A content and cholesterol content of eggs from a large population of chickens. The variances were calculated as shown in the table below.

Trait

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123.5

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VE

96.2

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VD

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a)Calculate broad and narrow sense heritability for the two traits.

b)What do you need to assume to complete part (a.)

c)Which trait if either is likely to respond to selection best in the short term and in

the long term.

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