A dog breeder thinks that he will be able to charge higher prices for extra-tiny versions of small dogs. He starts off by trying to selectively breed smaller Yorkshire terriers. The average adult mass of the terriers in his kennel is 2.5 kg. He selects a subset of the smallest dogs to found his new tiny dog line. The average mass of the 20 selected dogs is 1.8 kg. He chooses mated pairs randomly from that pool of 20 dogs and rears the resulting puppies to adulthood. The average mass of these offspring was 2.4 kg. Disappointed with the results, the breeder wants your help in figuring out where his plan went wrong. 5a.What is the narrow-sense heritability of body size in his population of dogs? 5b. You examine his records and calculate the total phenotypic variance VP across his whole starting population of yorkies to be 1.1. What is the additive genetic variance VA in this population?
A dog breeder thinks that he will be able to charge higher prices for extra-tiny versions of small dogs. He starts off by trying to selectively breed smaller Yorkshire terriers. The average adult mass of the terriers in his kennel is 2.5 kg. He selects a subset of the smallest dogs to found his new tiny dog line. The average mass of the 20 selected dogs is 1.8 kg. He chooses mated pairs randomly from that pool of 20 dogs and rears the resulting puppies to adulthood. The average mass of these offspring was 2.4 kg. Disappointed with the results, the breeder wants your help in figuring out where his plan went wrong. 5a.What is the narrow-sense heritability of body size in his population of dogs? 5b. You examine his records and calculate the total phenotypic variance VP across his whole starting population of yorkies to be 1.1. What is the additive genetic variance VA in this population?
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter5: The Inheritance Of Complex Traits
Section: Chapter Questions
Problem 17QP: Monozygotic (MZ) twins have a concordance value of 44% for a specific trait, whereas dizygotic twins...
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A dog breeder thinks that he will be able to charge higher prices for extra-tiny versions of
small dogs. He starts off by trying to selectively breed smaller Yorkshire terriers. The average
adult mass of the terriers in his kennel is 2.5 kg. He selects a subset of the smallest dogs to found
his new tiny dog line. The average mass of the 20 selected dogs is 1.8 kg. He chooses mated
pairs randomly from that pool of 20 dogs and rears the resulting puppies to adulthood. The
average mass of these offspring was 2.4 kg. Disappointed with the results, the breeder wants
your help in figuring out where his plan went wrong.
small dogs. He starts off by trying to selectively breed smaller Yorkshire terriers. The average
adult mass of the terriers in his kennel is 2.5 kg. He selects a subset of the smallest dogs to found
his new tiny dog line. The average mass of the 20 selected dogs is 1.8 kg. He chooses mated
pairs randomly from that pool of 20 dogs and rears the resulting puppies to adulthood. The
average mass of these offspring was 2.4 kg. Disappointed with the results, the breeder wants
your help in figuring out where his plan went wrong.
5a.What is the narrow-sense heritability of body size in his population of dogs?
5b. You examine his records and calculate the total
starting population of yorkies to be 1.1. What is the additive genetic variance VA in this
population?
5c. The breeder clearly kept very good records of dog size measurements across the pedigrees in
his kennel. What might he have done with those data before he started this artificial selection
project to assess the plan’s feasibility?
his kennel. What might he have done with those data before he started this artificial selection
project to assess the plan’s feasibility?
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