Question

1) Suppose you know the following information about 3 loci that influence yearling weight in sheep:

a) The average yearling weight for a population of rams is 160lbs. Complete the following table (2pt for the entire table)

b) Which Ram is heaviest?

c) Which Ram has the highest estimated breeding value?

d) What is the yearling weight EPD of Rambler?

e) Explain what your answer in part d) means.

f)If Ramsey was mated to a female whose additive gene value was average, what would be the expected breeding value (EBV) of their offspring?

Allele Independent Gene Effect Locus "A" A +2 -2 a "В" +6 b -6 "С" C +7 -7 c Animal Additive Phenotype Genotype Gene Genotypic Environmental Gene Value Combination Value Effect Value Rampage AaBbCc AaBBC +3 +5 Rambo -6 +1 Rambler AABbcc AAbbCC +4 -2 Ramsey +0 +6

Answer 1

Addictive gene value or breeding value: It is the additive effect of all the alleles present on the locus during crossover ( independent gene value).

Genotypic value: It is the addition of breeding value and gene effects.

Suppose you know the following information about 3 loci that influence yearling weight in sheep Allele Independent Gene Effect Locus +6 -6 a)

The average yearling weight for a population of rams is 160lbs. Complete the following table (0.5pt for each animal so 2pt for the entire table) AnimalGenotype Additive Genotypic Environmental Phenotype Effect Gene Gene Value Combination Value Value AaBbCc AaBBCo AABbcc AAbbCC +5 Rampage Rambo Rambler Rams -6 2 +6 +0 b)

Which Ram is heaviest? (0.5pt) c) Which Ram has the highest estimated breeding value? (0.5pt) d) Calculate the EPD for each animal? (1pt) Animal Rampage Rambo Rambler Rams EPD