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प्रश्न
Explain the following term with example.
Co-dominance
उत्तर
Codominance (1: 2: 1) refers to the phenomenon in which two alleles (different forms of a Mendelian component present on the same gene locus on homologous chromosomes) lack a dominant-recessive link and can express themselves independently when present together.
Example - AB blood group: Alleles for blood groups A (IA) and B (IB) are codominant; therefore, they form blood group AB when they come together in a person. It can be identified by the presence of antigens A (from IA) and B (from IB) on the surface of erythrocytes.
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संबंधित प्रश्न
Answer the following question.
Differentiate between incomplete dominance and co-dominance. Substantiate your answer with one example of each.
ABO blood group system is due to ______.
In humans, the dominance relationship between the A and B alleles of the ABO blood group gene is an example of ______.
Person having genotype IA IB would show the blood group as AB. This is because of ______.
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
Multiple alleles control inheritance of ______.
Alleles that produce independent effects in their heterozygous condition are called ______.
The number of phenotypes in ABO blood groups is ______.
Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group respectively. What would be the genotype of both mother and father?
What can be the blood group of offspring when both parents have AB blood group?
Inheritance of roan coat in cattle is an example of ______.
ABO blood grouping in human beings cites the example of ______.
In mice, Y is the dominant allele for yellow fur and y is the recessive allele for grey fur. Since Y is lethal when homozygous, the result of cross Yy × Yy will be ______.
How many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci?
F2 generation is produced by ______
When both alleles express their effect on being present together, the phenomenon is called:
Discuss the genetic basis of wrinkled phenotype of pea seed.
With the help of an example differentiate between incomplete dominance and co-dominance.
In shorthorn cattle, the coat colours red or white are controlled by a single pair of alleles. A calf which receives the allele for red coat from its mother and the allele for white coat from its father is called a 'roan'. It has an equal number of red and white hairs in its coat.
- Is this an example of codominance or of incomplete dominance?
- Give a reason for your answer.
- With the help of genetic cross explain what will be the consequent phenotype of the calf when,
- red is dominant over white.
- red is incompletely dominant.
