. Most economically important traits in food producing animals and many traits o
ID: 196975 • Letter: #
Question
. Most economically important traits in food producing animals and many traits of interest in companion animals and horses are polygenic, i.e., they are influenced by an unknown, large number of loci. Also most of these traits are measured as quantities rather than qualities. The basic processes of inheritance at individual loci are the same as for simply-inherited traits. The purpose of this exercise is to help you think about how the effects of individual loci accumulate to produce the total genetic effect of several loci on genotypic value for polygenic traits. This exercise deals with the concepts of genotypic value, breeding value, various kinds of dominance as they apply to quantitative traits gene combination value, and GenotypeV alue Genotype Value Genotype Value 10 10 12 BB 16 Bb 5 CC 12 Cc 14 cc 8 DD 10 Dd 0 Independent Gene Effects: B s -6 Below are shown genotypes for a sire and dam for the four loci shown above. In the table below enter the genotypic value, breeding value, gene combination value, and progeny difference for each locus and the sum of all four loci for each parent. Locus G Type Aa Bb ce Dd Genotypic Aa Bb C DD Value Breeding Value Gene Combo Value Progeny Difference Answer the following questions from the previous problem 1. How many different gametes can this sire produce? 2. How many different gametes can this dam produce? 3. How many different full sib progeny genotypes can be produced by mating this sire and dam?Explanation / Answer
Question 1
Answer: The sire can produce 15 different gametes
Question 2
Answer: This dame can produce 16 different gametes.
Question 3
Answer: Can be done using computer software
Question 4
Answer:
Loci that expressed complete dominance is D (expressing DD)
Loci that expressed partial dominance are A and B
Loci that expressed no dominance is C (Dame expresses cc)
Now about the table:
To calculate the breeding value, add the average value of each allele. Like in Sire:
and for dame:
AA Bb cc Dd -1 5 -8 1Related Questions
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