Table of Contents
Codominance
In codominance, both alleles are expressed in the phenotype of the organism. This occurs when the alleles are located on the same chromosome and expressed together. For example, in humans, the blood type AB is a result of codominance. The A and B alleles both expressed in the phenotype of an AB individual.
Incomplete Dominance:
In incomplete dominance, one allele is expressed in the phenotype of the organism and the other allele is not expressed. This occurs when the alleles are located on different chromosomes. For example, in snapdragons, the allele for red flowers (R) is dominant over the allele for white flowers (r). However, when the alleles are located on the same chromosome, as in snapdragons with the allele for purple flowers (RP), both alleles are expressed in the phenotype and the flowers are purple.
Dominance:
In dominance, one allele is expressed in the phenotype of the organism and the other allele is not expressed. This occurs when the alleles are located on the same chromosome. For example, in humans, the allele for brown eyes (B) is dominant over the allele for blue eyes (b).
What is meant by Dominance?
- Dominance a term used in animal behavior to describe a hierarchy in a group of animals. The animal at the top of the hierarchy is the dominant animal and the one at the bottom is the subordinate. Dominance can established by physical aggression, such as fighting, or by displays of dominance, such as posturing or vocalizing. The dominant animal is typically the one that gets its way in disputes with other animals and has priority access to food, mates, and shelter.
- Dominance has a few different definitions, but in general it is when one entity is in control of another. This can be through physical force, through threat of violence, or through more subtle means such as through economic or political power. Dominance can also used to describe a social hierarchy in which a certain group or individual has more power and status than others.
Meaning of Codominance
- Codominance is a type of inheritance in which two alleles for a gene expressed equally in the phenotype. This occurs when the alleles are located on different chromosomes. For example, in the ABO blood group system, the alleles for blood type A and blood type B are codominant. This means that a person can have the A or B allele for blood type and still have the blood type phenotype.
- Codominance a term used in genetics to describe a situation in which two alleles of a gene each expressed in the phenotype of a heterozygote. In other words, codominance is a type of inheritance in which both alleles expressed in the phenotype of the heterozygote. For example, in codominant inheritance, the allele for blue eyes and the allele for brown eyes both expressed in the phenotype of the heterozygote. This is in contrast to incomplete dominance, in which only one allele expressed in the phenotype of the heterozygote.
- Codominance often confused with dominant and recessive inheritance, but it is actually quite different. Dominant and recessive inheritance are both types of Mendelian inheritance, while codominance is a type of non-Mendelian inheritance. Mendelian inheritance is based on the principle of segregation, while non-Mendelian inheritance is not.
- Codominance was first discovered in chickens by Thomas Hunt Morgan and his team in the early 1900s. They were studying the inheritance of coat color in chickens and noticed that some chickens had a mix of white and black feathers. These chickens called hybrid chickens, and Morgan and his team discovered that the gene for white feathers and the gene for black feathers both expressed in the phenotype of the heterozygote. This was the first time that codominance was discovered.
What is Incomplete Dominance?
Incomplete dominance is a type of genetic inheritance in which the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. This occurs when one allele is not completely dominant over the other. For example, in the case of a blood type, if a person has the A allele and the B allele, their blood type will be AB. This is because the A allele is not completely dominant over the B allele.
Examples of Codominance
One example of codominance is the AB blood type. In this blood type, both the A and B antigens are present on the red blood cells. This means that both the A and B blood types are possible in someone with AB blood. Another example of codominance is the roan color in horses. In this case, the red and white colors are both present in the hair, and the horse appears roan.
FAQs
Codominance is a type of inheritance where both alleles of a gene are expressed in the phenotype of an organism. It is different from dominant and recessive traits, where one allele is expressed while the other is not. Below are some frequently asked questions (FAQs) about codominance.
Q1: What is an example of codominance?
A1: An example of codominance is the AB blood type. In this example, both alleles (A and B) of the gene for the blood type are expressed in the phenotype, so individuals with the AB blood type have both A and B antigens on their red blood cells.
Q2: How is codominance different from dominant and recessive traits?
A2: In dominant and recessive traits, only one allele is expressed in the phenotype while the other is not. In codominance, both alleles are expressed in the phenotype.
Q3: Are codominant traits inherited?
A3: Yes, codominant traits are inherited in the same way as dominant and recessive traits.
Q4: Is codominance common?
A4: Codominance is not as common as dominant and recessive inheritance, but it does occur in some organisms.
