ALS 3104 Homework #2
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HERITABILITY AND REPEATABILITY
PROBLEM A
Consider the following information on weaning weights from a large herd of zebras. Assume (for the
moment) that there is no variation due to contemporary group effects.
Herd

THE GENETIC MODEL FOR
QUANTITATIVE TRAITS
THE GENETIC MODEL
FOR QUANTITATIVE TRAITS
(CHAPTER 7)
n The basic model of
Chapter 7, Part a
THE GENETIC MODEL FOR
QUANTITATIVE TRAITS (CHAP 7)
quantitative genetics
n Breeding value
n Allelic combination values
n

2/13/16
HERITABILITY AND REPEATABILITY
(CHAPTER 9)
HERITABILITY
AND
REPEATABILITY
Repeatability
n Definitions, properties, importance
n Ways to improve heritability and
repeatability - environmental uniformity
n Accurate and precise measurement
(from stat

BLACK HORSE FARM
If both parents are EEaa:
Do black horses
breed true?
What genotypes may
a phenotypically
black horse have?
Ea
Ea
If one parent is Eeaa
and the other is EEaa:
EEaa
If both parents are Eeaa:
Ea
ea
EEaa
Eeaa
Ea
There are other
possibiliti

ALS 3104 Friday Problem Set 3
The genetic model
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1.
Signatures:
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Consider the model:
P = + BV + GCV + E p + E t
Define the meaning of each term in the model in your own words. (Aim for a single sentence per
term.)
2. Given the following n

ALS 3104 Homework #3
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Signature _
INBREEDING
PROBLEM A
Given the following pedigree information:
B
S
E
M
D
F
N
X
C
A1. Calculate the inbreeding coefficient of individual X.
A2. What is the relationship (in words, not numbers) between individuals E a

ALS 3104 Friday Problem Set 8
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Signatures:
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1. What are the inbreeding coefficients of the offspring (individual X) of matings between the
following relatives? Draw an arrow diagram for each and show your calculations.
a)
first cousins
b)

ALS 3104 Friday Problem Set 6
Genetic prediction, BLUP
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Signatures:
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BV =
t
rBV ,BV i BV
L
1.
A lizard rancher runs a closed herd of Leaping Lizards. He normally keeps and breeds the top 3%
of his male lizards based on individual performa

ALS 3104 Friday Problem Set 4
Statistics
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Signatures:
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For this exercise and all future problem sets, please label your work in terms of units. You
must do so to receive full credit !
1. You are interested in developing miniature work pon

ALS 3104 Homework #1
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Signature _
ALLELIC FREQUENCIES
PROBLEM A
Cod fish have two forms of hemoglobin determined by alleles m and r at one locus. A sample of
cod taken off the Norwegian coast had the following frequencies of the three genotypes:
mm

ALS 3104 Friday Problem Set 2
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Allelic and genotypic frequencies Part 2
Signatures:
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1. The following numbers of the ostrich M-N blood groups were recorded in a sample of meattype birds:
MM
MN
NN
1787
3039
1303
a)
b)
What are the genotypi

ALS 3104 Friday Problem Set 9
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Signatures:
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1. A rancher has a herd of Angus, Red Angus and Hereford cows. She plans to mate them to
Charolais and Angus bulls.
Typical F1 individual hybrid vigor for weaning weight in cattle is 27 lb. How

ALS 3104 Friday Problem Set 1
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Dominance, epistasis
Signatures:
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Problem 1
The basic coat colors in horses are chestnut, bay and black (Sponenberg, 1996). The two
autosomal loci controlling these basic colors are designated Extension (E)

ALS 3104 Friday Problem Set 5
Heritability, repeatability
Names:
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Signatures:
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1. Age-of-dam adjustment factors for weaning weight in a particular breed of beef cattle are:
Cow Age (yr)
2
3
4
5+
Adjustment (lb)
+60
+40
+20
0
1a. Calculate the st

HERITABILITY
HERITABILITY
AND
REPEATABILITY
Designated as: h2
Definitions
Some common misconceptions
Chapter 9a
Importance
selection
prediction
management
HERITABILITY
h2 = (rP,BV) 2
HERITABILITY
First of four descriptions
measures the degree to

THE GENETIC MODEL FOR
QUANTITATIVE TRAITS
Chapter 7, Part 2
GENE COMBINATION VALUE
As discussed earlier, the breeding value
is that part of the genotypic value
transmitted from parent to offspring
The remaining portion of the genotypic
value is called t

1/15/16
WHICH IS
THE BEST DAIRY COW?
WHAT IS THE BEST ANIMAL?
Chapter 1
Make sure
that you
learn
vocabulary
in these
first
chapters
n
n
n
n
n
n
n
Produces the most milk
Produces milk efficiently on forage
Has best feet, legs, udder support
Is innately res

STATISTICS APPLICATIONS TO
QUANTITATIVE GENETICS
Chapter 8A
THIS LECTURE AND THE NEXT.
A
review of STAT 2004
concepts and methods of
statistics with emphasis on
interpretation of statistical arguments.
An introduction to design of experiments,
data anal

CHANGING
POPULATIONS
Chapter 4
n
n
n
The Mendelian principles discussed so far
indicate genetic mechanisms that control
production of individual genotypes
In animal breeding, goal is to change
genetic composition of entire populations
In the next lectures