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23 Nov 2019

Consider a hypothetical quantitative trait (a weight of some kind) affected by five loci for the two individuals (1) and (2). Assume the following: Complete dominance at each locus. No epistasis. The independent effect of each dominant gene is +8 lb. The independent effect of each recessive gene is -3 lb. The phenotypic mean for the trait = 600 lbs. (1) AaBbCcDdEe (2) AAbbCCddEE

I need to find BV G GCV P for each individual. I know that E for (1) = -15 and E for (2) = 12.

Please help! I really need to know the process behind each answer!

BV = Breeding Value

G = Genotypic Value

GCV = Gene Combination Value

E = environmental effect

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Beverley SmithLv2
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Related questions

QUESTION 1

Jim is blood type A, his brother John is type O and his sister Jane is type AB. What are the genotypes of their parents?
A.
IAi and IBi
B.
IAIA and IBIB
C.
IAi and IBIB
D.
IAIB and ii
E.
IAIA and IBi

QUESTION 2

Which of the following is true for alleles that show incomplete dominance?
A.
Heterozygotes have a genotype like the dominant allele.
B.
Homozygotes have a genotype like the recessive allele.
C.
Heterozygotes have a phenotype intermediate between the dominant and recessive alleles.
D.
Homozygotes have the same phenotype as the heterozygotes.
QUESTION 3

Which principle of inheritance concluded that when games are formed in meiosis, the two alleles of each gene separate from one another, and each gamete receives only one allele?
A.
independent assortment
B.
heterozygosity
C.
segregation
D.
dominance
QUESTION 4

Which term best describes a condition in which alleles at one locus can alter the expression of alleles at another locus?
A.
polygenic inheritance
B.
codominance
C.
multiple alleles
D.
pleiotropy
E.
epistasis
QUESTION 5

A single unit of genetic information located on a chromosome defines:
A.
a trait
B.
an allele
C.
a chromosome
D.
a locus
E.
a gene
QUESTION 6

The physical expression (appearance or function) of an organism's genes defines:
A.
genotype
B.
a single characteristic
C.
physiology
D.
mutation
E.
phenotype
QUESTION 7

Palomino horses (golden color with a blond mane) are an incompletely dominant trait produced by the combination of the chestnut color allele and the cream color allele. If you wanted to produce as many palominos as possible, which mating strategy below would be the best choice?
A.
Chestnut x Cream
B.
Palomino x Cream
C.
Palomino x Chestnut
D.
Palomino x Palomino
QUESTION 8

Which term best describes the effect of a single gene on multiple aspects of the phenotype?
A.
epistasis
B.
pleiotropy
C.
multiple alleles
D.
codominance
E.
polygenic inheritance
QUESTION 9

Which term best describes the separate expression of both alleles for a single trait in the same cell?
A.
multiple alleles
B.
codominance
C.
pleiotropy
D.
epistasis
E.
polygenic inheritance
QUESTION 10

One form of a gene found on a single chromosome defines:
A.
an allele
B.
a locus
C.
a chromosome
D.
a trait
E.
a gene
QUESTION 11

A chocolate lab (whose mother was a yellow lab) is mated with a black lab whose genotype is BbEe. What fraction of the offspring would be expected to be yellow labs?
A.
1/4
B.
none
C.
1/2
D.
3/16
E.
1/8
QUESTION 12

What type of allele is always expressed regardless of whether the individual is homozygous or heterozygous for it?
A.
Both the dominant and recessive alleles
B.
Recessive allele
C.
Allosteric allele
D.
Lethal allele
E.
Dominant allele
QUESTION 13

Given the parents AABBGgHhrr × AabbGgHhRr, assume simple dominance and independent assortment. What proportion of the progeny will be expected to have the genotype AaBbggHHrr?
A.
1/256
B.
1/64
C.
1/16
D.
1/32
E.
1/128
QUESTION 14

___________________ is defined as having two of the same type of allele for a particular trait.
A.
Homozygous
B.
Dominance
C.
Incomplete dominance
D.
Heterozygous
E.
Genotype

QUESTION 15

The physical position of an allele on a single chromosome defines:
A.
an allele
B.
a chromosome
C.
a gene
D.
a locus
E.
a trait
QUESTION 16

Which term best describes two or more genes affecting the phenotype in an additive fashion?
A.
codominance
B.
polygenic inheritance
C.
multiple alleles
D.
pleiotropy
E.
epistasis

Adapted from Question 22. Essentials of Genetics, 9th ed., Klug et al., Pearson.
Labrador retrievers may be black, brown, or golden in color. This coat color is controlled by an interaction
of two genes at independent loci. Gene B encodes dark color, where a dominant allele codes for black and
recessive codes for brown. Gene E programs the expression of color, where a dominant allele results in
expression (either black or brown, depending on the genotype at the B locus), and recessive prevents
expression (resulting in a yellow coat color, regardless of the genotype at the B locus).
Although each color may breed true, many different outcomes occur in different matings where the
parents are not true breeding. The following results show some of the possibilities.
Parent Mating Progeny Outcome
(a) Black x Brown all black
(b) Black x Golden all black
(c) Black x Brown 1/2 black, 1/2 brown
(d) Black x Brown 3/4 black, 1/4 golden
(e) Brown x Brown 3/4 brown, 1/4 golden
(f) Black x Golden 2/4 golden, 1/4 black, 1/4 brown
(g) Black x Golden 4/8 golden, 3/8 black, 1/8 brown
(h) Black x Black 9/16 black, 4/16 golden, 3/16 brown
Select two of these matings to discuss in your paper. One mating must be (a), (b), (c), or (d); the other
must be (e), (f), (g), or (h). For each mating, indicate the parental genotypes as completely as possible, and
how this produces the corresponding progeny outcome. Describe the basis for these results. (i.e. Explain
the reasoning you used to arrive at your conclusion). Although not required, it may be helpful to start with
keyouts to determine the genotypes that would breed true for each color.
Requirements
for Evaluation
Possible
Points
Content:
 Discussion demonstrates mastery of related course concepts
o Genotypes, gamete types, and gene interactions are described with
sufficient detail to indicate their contribution to the corresponding
phenotypic ratio
o Appropriate terms are included and used correctly
 Response is focused, well-developed, and includes specific detail
 Overall structure is clear, logical, and well organized
 Body of completed paper is 300-500 words
 No references necessary
14
Style:
 Clarity: clear, easy to understand
 Structure: varied sentence pattern
 Tone: professional and polished; personal style; maintains interest
3
Mechanics:
 Correct grammar, syntax, spelling, and punctuation
3

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