What is Codominance What is codominance Codominance condition

  • Slides: 10
Download presentation
What is Codominance?

What is Codominance?

What is codominance? • Codominance: condition in which both alleles of a gene are

What is codominance? • Codominance: condition in which both alleles of a gene are expressed in heterozygous offspring. Example: In certain chickens black feathers are codominant with white feathers. Heterozygous chickens have black and white speckled feathers.

Example 1: In cows black coat color and white coat color are codominant. Heterozygous

Example 1: In cows black coat color and white coat color are codominant. Heterozygous offspring will be spotted. 1. Black cow and White cow BB x WW B B W W Genotypic Ratio: BW BW 100% BW BW BW 100% Spotted cow Phenotyp ic Ratio:

Multiple Alleles • 3 or more alleles of the same gene that code for

Multiple Alleles • 3 or more alleles of the same gene that code for a single trait • In humans, blood type is determined by 3 alleles – A, B, and O BUT each human can only inherit 2 alleles 1. Dominant – A and B (codominance) 2. Recessive – O

How do the multiple alleles work with codominance? Blood Type (phenotype) Genotype A AA

How do the multiple alleles work with codominance? Blood Type (phenotype) Genotype A AA or AO B BB or BO AB AB O OO

Determine the possible blood types of the offspring when: Mother is type AB, Father

Determine the possible blood types of the offspring when: Mother is type AB, Father is Type A (heterozygous) Genotypic Ratio: A B 25% AO A AA O 25 % AA AO AB BO 25% AB 25% BO Phenotypic Ratio: 50% Type A Blood 25% Type AB Blood 25% Type B Blood

Incomplete dominance • Incomplete dominance - when one allele is not completely dominant over

Incomplete dominance • Incomplete dominance - when one allele is not completely dominant over another. – Heterozygous genotype = BLEND • Since one allele is not completely dominant over the other allele, we use two different capital letters to represent the alleles Homozygous Heterozygous Homozygous RR RW WW (Red) (Pink) (White)

Codominance • Codominance - both alleles contribute to the phenotype. – Heterozygous genotype =

Codominance • Codominance - both alleles contribute to the phenotype. – Heterozygous genotype = both traits appear • Since one allele is not completely dominant over the other allele, and both traits appear together, we use two different capital letters to represent the alleles Homozygous Heterozygous WW BB BW (White) (Black and White)

Practice Identifying • A cat can be black, tan, or tabby (black & tan)

Practice Identifying • A cat can be black, tan, or tabby (black & tan) • 1. Incomplete Dominance or Codominance? • 2. Genotypes: black- BB tan – TT tabby – BT

Practice Identifying • A sneech can be tall, short, or medium • 1. Incomplete

Practice Identifying • A sneech can be tall, short, or medium • 1. Incomplete Dominance or Codominance? • 2. Genotypes: tall- TT short – SS medium – TS

l l waiteventqueue condition waiteventinterruptiblequeue condition waiteventtimeoutqueue conditionl l waiteventqueue condition waiteventinterruptiblequeue condition waiteventtimeoutqueue condition
Incomplete Vs Codominance Codominance A form of inheritanceIncomplete Vs Codominance Codominance A form of inheritance
WORK SHEET ON CODOMINANCE AND INCOMPLETE DOMINANCE CoDominanceWORK SHEET ON CODOMINANCE AND INCOMPLETE DOMINANCE CoDominance
Monitors and Semaphores Annotated Condition Variable Example ConditionMonitors and Semaphores Annotated Condition Variable Example Condition
Range Condition Stocking Rate Range Condition Determining theRange Condition Stocking Rate Range Condition Determining the
PUMP CONDITION EVALUATION PUMP CONDITION EVALUATION BEARINGS PUMPPUMP CONDITION EVALUATION PUMP CONDITION EVALUATION BEARINGS PUMP
Condition Rating CONDITION RATING Technical Standards Branch ClassCondition Rating CONDITION RATING Technical Standards Branch Class
Infrastructure Condition Assessment Overview Purpose Infrastructure Condition AssessmentInfrastructure Condition Assessment Overview Purpose Infrastructure Condition Assessment
Condition Rating CONDITION RATING Technical Standards Branch ClassCondition Rating CONDITION RATING Technical Standards Branch Class