3. (4 points) Animal scientists are trying to decrease the fat content in a herd of cattle. Their original herd had a mean fat content of 12%. They selected individuals with a mean fat content of 8% to be the parents of the next generation, and the mean fat content of the progeny population was 9.5%. a. What is the narrow sense heritability ($h^2$) of fat content in this population (show your work)?
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Step 1: The formula for narrow sense heritability ($h^2$) is: $h^2 = \frac{R}{S}$ where R is the response to selection and S is the selection differential. Show more…
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Genetics question 1: a) In a population of cattle, the average body fat percentage is 11.1%. You select parents with an average body weight percentage of 29.7%. The offspring they produce have an average body weight percentage of 16.7%. Based on these data, what is the narrow-sense heritability of this trait? Enter your answer as a decimal to the nearest 0.01. b) In a population of pigs, the average body weight is 184 kg. The narrow sense heritability for this trait is h2 = 0.7. If you were to select pigs that have an average weight of 176 kg to breed, what would be the predicted weight of their progeny? Enter your answer to the nearest 0.1 kg. c) In a F2 intercross to investigate the genetic basis of fruit weight, it was found that 1 out of every 256 plants in the F2 generation had the same weight as one of the original parents. Based on these data, approximately how many genes control variation in this trait? d) Phenotypic variation in tail length of unicorns has the following components: Additive genetic variance = 289 Dominance genetic variance = 215 Environmental variance = 232 What is the broad-sense heritability for tail length in these unicorns? Enter your answer to the nearest 0.01.
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In a large herd of cattle, three different characters showing continuous distribution are measured, and the variances in the following table are calculated: a. Calculate the broad- and narrow-sense heritabilities for each character. b. In the population of animals studied, which character would respond best to selection? Why? c. $A$ project is undertaken to decrease mean fat content in the herd. The mean fat content is currently 10.5 percent. Animals with a mean of 6.5 percent fat content are interbred as parents of the next generation. What mean fat content can be expected in the descendants of these animals?
In a population of cattle, the average body fat percentage is 10.8%. You select parents with an average body weight percentage of 21%. The offspring they produce have an average body weight percentage of 16.3%. Based on these data, what is the narrow-sense heritability of this trait? Enter your answer as a decimal to the nearest 0.01.
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