Table of Contents
Concept of Dominance
Dominance is a concept in animal behavior, where a dominant animal has priority access to resources over other members of the same species. Dominance is determined by the animal’s ability to control access to important resources, such as food, shelter, or mates. In social animals, dominance is also determined by aggressive behavior and the ability to intimidate others.
Incomplete Dominance and Codominance
Incomplete dominance is a type of genetic interaction in which the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. Codominance is a type of genetic interaction in which the phenotype of the heterozygote is indistinguishable from the phenotype of either of the two homozygotes.
Introduction of Incomplete Dominance
Incomplete dominance, also known as co-dominance, is a type of genetic inheritance in which the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. Incomplete dominance is exhibited by a heterozygote whose phenotype is different from either of the two homozygotes. For example, in the case of flower color in plants, if a plant is heterozygous for flower color (Aa), its flowers will be pink, because the dominant allele A will express itself more strongly than the recessive allele a.
What is Incomplete Dominance?
Incomplete dominance is a type of genetic crossover in which the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. This occurs when the dominant allele is not completely dominant over the recessive allele. Incomplete dominance also known as partial dominance.
Mechanism of Incomplete Dominance
Incomplete dominance is a type of genetic inheritance in which one allele is not completely dominant over the other. This results in a blended phenotype in which the traits of both alleles expressed. For example, incomplete dominance might occur when a red flower crossed with a white flower. The offspring would have a pink flower, because the red allele is not completely dominant over the white allele.
Examples of Incomplete Dominance
Incomplete dominance is a type of genetic crossing over in which one allele is not completely dominant over the other. This results in a blended phenotype in which the characteristics of both alleles expressed. For example, incomplete dominance might occur in plants that bred to have red flowers. If one parent plants has a red allele and the other has a white allele, the plants that grow from their offspring will have pink flowers. This is because the red allele is not completely dominant over the white allele, and their offspring exhibit a blended phenotype.
In Other Animals
The ovaries are located in the abdomen. In these animals, the eggs travel from the ovaries to the uterus through the oviduct.
In Plants
The plant hormone auxin is responsible for many aspects of plant growth and development, including the control of cell division, the elongation of stems, and the growth of roots. Auxin produced in the tips of the shoots and the roots, and transported throughout the plant by the movement of water and dissolved minerals.
Introduction of Codominance
Codominance is a type of genetic inheritance in which both alleles for a gene are expressed. The term codominance was first used in the early 1900s to describe the inheritance of blood types in humans. In codominant inheritance, both alleles expressed equally. This results in a phenotype that is different from either allele. For example, the blood type AB is the result of codominant inheritance. Both alleles for the blood type gene expressed, resulting in a blood type that is different from either A or B.
Difference Between Incomplete Dominance and Codominance
- Incomplete dominance is when the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. Codominance is when the phenotype of the heterozygote is the same as the phenotype of the two homozygotes.
- Incomplete dominance is a type of inheritance in which one allele is not completely dominant over the other. This results in a phenotype that is a mixture of the two alleles. Codominance is a type of inheritance in which both alleles expressed equally. This results in a phenotype that is a combination of the two alleles. Incomplete dominance and codominance are both types of allele expression.
