1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). If 2 erminette chickens are crossed, what is the probability that: They would have a black chick? They would have a white chick? 2. Human blood types are determined by genes that follow the CODMINANCE pattern of inheritance. There are 2 dominant alleles (IA and IB) and one recessive allele (i). Blood Type (Phenotype) Genotype Can donate blood to: Can receive blood from: ii A,B,AB and O A,B,AB,O (universal receiver) АВ JAIB AB JAJA or 1Ai АВ, А O,A IB|B or 1Bi АВ, В O.B a) Pretend the Brad Pitt is homozygous for the type B allele and Angelina Jolie is type "O". What are all the possible blood types for the baby? b) Draw a Punnett square showing all the possible blood types for the offspring produced by type "O" mother and a type "AB" father
1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). If 2 erminette chickens are crossed, what is the probability that: They would have a black chick? They would have a white chick? 2. Human blood types are determined by genes that follow the CODMINANCE pattern of inheritance. There are 2 dominant alleles (IA and IB) and one recessive allele (i). Blood Type (Phenotype) Genotype Can donate blood to: Can receive blood from: ii A,B,AB and O A,B,AB,O (universal receiver) АВ JAIB AB JAJA or 1Ai АВ, А O,A IB|B or 1Bi АВ, В O.B a) Pretend the Brad Pitt is homozygous for the type B allele and Angelina Jolie is type "O". What are all the possible blood types for the baby? b) Draw a Punnett square showing all the possible blood types for the offspring produced by type "O" mother and a type "AB" father
Human Biology (MindTap Course List)
11th Edition
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cecie Starr, Beverly McMillan
Chapter19: Introduction To Genetics
Section: Chapter Questions
Problem 9CT
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![1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the
allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). If 2
erminette chickens are crossed, what is the probability that:
They would have a black chick?
They would have a white chick?
%
2. Human blood types are determined by genes that follow the CODMINANCE pattern of inheritance. There are
2 dominant alleles (IA and IB) and one recessive allele (i).
Blood Type (Phenotype)
Genotype
Can donate blood to:
Can receive blood from:
ii
A,B,AB and O
A,B,AB,O (universal
receiver)
АВ
JA|B
AB
JAJA or 1Ai
АВ, А
O,A
АВ, В
O,B
!al JO glal
a) Pretend the Brad Pitt is homozygous for the type B allele and Angelina Jolie is type "O". What are all the
possible blood types for the baby?
b) Draw a Punnett square showing all the possible blood types for the offspring produced by type "O" mother
and a type "AB" father](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F59b6b70e-71b7-4957-8f76-56addbac1a28%2F3a162b07-34c7-44ff-96b9-f92d99c13cd7%2Fblmwe6_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the
allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). If 2
erminette chickens are crossed, what is the probability that:
They would have a black chick?
They would have a white chick?
%
2. Human blood types are determined by genes that follow the CODMINANCE pattern of inheritance. There are
2 dominant alleles (IA and IB) and one recessive allele (i).
Blood Type (Phenotype)
Genotype
Can donate blood to:
Can receive blood from:
ii
A,B,AB and O
A,B,AB,O (universal
receiver)
АВ
JA|B
AB
JAJA or 1Ai
АВ, А
O,A
АВ, В
O,B
!al JO glal
a) Pretend the Brad Pitt is homozygous for the type B allele and Angelina Jolie is type "O". What are all the
possible blood types for the baby?
b) Draw a Punnett square showing all the possible blood types for the offspring produced by type "O" mother
and a type "AB" father
![PART 6: CODOMINANCE (1 POINT)
There is another pattern of inheritance that also is an example of lack of dominance. In this situation, if the
resulting phenotype exhibits both traits of the parents, the offspring phenotype is said to be the result of
codominance. Examples of this include A and B blood types in humans, sickle-cell disease, and coat color in
cattle and horses.
In this last example, cattle which are homozygous for a red coat allele are red, cattle which are homozygous for a
white coat allele are white, and heterozygous cattle appear roan (red hairs mixed with white) due to codominance
of the red and white coat color alleles, In this case it is common to use two different capital letters of the alphabet
as superscripts to a common letter, to represent the red and white coat color alleles. For example, red cattfe
would be C"c white cattle would be C"C" and roan cattle would be C"C", where:
red coat
CW = white coat
and
How is this different from red, white, and pink flowers?
Cattle coat color would be considered incompletely dominant if C"C" were completely pink, instead of a patchy
red and white.
Camation petal color would be considered codominant if RW were red and white striped, instead of solid pink.
Nevertheless, both these patterns of inheritance are important for they deviate from the basic
dominant/recessive pattern of inheritance.
In summary:
Cattle and Horse Coat Color
Resulting Phenotype
Genotype
c*CR
C"CW
C*CW
Red coat
White coat
Roan coat (red hairs mixed with white)
PRACTICE PROBLEM:
A roan bull (male) is mated with a white cow (female). What are the possible offspring?
Cow's genotype:
Bull's genotype:
Fill in the Punnett square and give the phenotype
percentages of this cross:
Punnett square:
color
% are
color
% are
Could Red offspring be born to a White cow mated with a Roan bull?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F59b6b70e-71b7-4957-8f76-56addbac1a28%2F3a162b07-34c7-44ff-96b9-f92d99c13cd7%2Fyue1689_processed.jpeg&w=3840&q=75)
Transcribed Image Text:PART 6: CODOMINANCE (1 POINT)
There is another pattern of inheritance that also is an example of lack of dominance. In this situation, if the
resulting phenotype exhibits both traits of the parents, the offspring phenotype is said to be the result of
codominance. Examples of this include A and B blood types in humans, sickle-cell disease, and coat color in
cattle and horses.
In this last example, cattle which are homozygous for a red coat allele are red, cattle which are homozygous for a
white coat allele are white, and heterozygous cattle appear roan (red hairs mixed with white) due to codominance
of the red and white coat color alleles, In this case it is common to use two different capital letters of the alphabet
as superscripts to a common letter, to represent the red and white coat color alleles. For example, red cattfe
would be C"c white cattle would be C"C" and roan cattle would be C"C", where:
red coat
CW = white coat
and
How is this different from red, white, and pink flowers?
Cattle coat color would be considered incompletely dominant if C"C" were completely pink, instead of a patchy
red and white.
Camation petal color would be considered codominant if RW were red and white striped, instead of solid pink.
Nevertheless, both these patterns of inheritance are important for they deviate from the basic
dominant/recessive pattern of inheritance.
In summary:
Cattle and Horse Coat Color
Resulting Phenotype
Genotype
c*CR
C"CW
C*CW
Red coat
White coat
Roan coat (red hairs mixed with white)
PRACTICE PROBLEM:
A roan bull (male) is mated with a white cow (female). What are the possible offspring?
Cow's genotype:
Bull's genotype:
Fill in the Punnett square and give the phenotype
percentages of this cross:
Punnett square:
color
% are
color
% are
Could Red offspring be born to a White cow mated with a Roan bull?
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