Codominance, Biology

Assignment Help:

CODOMINANCE

The alleles which do not show dominance-recessive relationship and are able to express themselves independently when present together are called codominant alleles. Independent expression of two alleles in an individual is termed codominance.

Example :- 1

Coat colour in short horned cattle

There are two types of pure short horned cattle, red and white. On cross breeding the individuals of F1 generation are found to have roan colour. The effect is produced due to juxtaposition of small patches of red and white colour. It is also known as mosaic inheritance. As both the alleles form small patches side by side, they are codominant. It was previously considered to be a case of incomplete dominance because the colour effect is intermediate between red and white, on in breeding the roan hybrids produce three type of cattle-red, roan and white in the ratio of 1 : 2 : 1.

Example :- 2

AB Blood Group

Alleles for blood group A (IA) and blood group B (IB) are codominant so that when they come together in an individual they produce blood group AB. It is characterised by the presence of both antigen A (from IA) and antigen B (from IB) over the surface of erythrocytes.

Example :- 3

MN Blood Group

This phenomenon has been observed in MN blood group in humans. The red blood cells can carry two types of native antigens M and N, and an individual can be MM, MN or NN, exhibiting either one or both of them.

Example :- 4

Sickle Cell Haemoglobin

The allele for sickle cell haemoglobin Hbs is codominant with allele for normal haemoglobin HbA.


Related Discussions:- Codominance

Excretory system, extensive note on the excretory system of amphibian

extensive note on the excretory system of amphibian

Which part of heart serves as an effector, Which of the following serves as...

Which of the following serves as an effector, or as part of an effector, that functions in a negative feedback system? A. Nicotinic Acetylcholine Receptors (nAChR) in SA node c

Define oral rehydration for treatment for pem, Define Oral rehydration for ...

Define Oral rehydration for treatment for pem? Since diarrhoea is very common in severe PEM, correction of dehydration is the first step in the treatment. Homemade (salt-sugar

Writing transport and flow expressions in simbiology, How do I write the ex...

How do I write the expression for reaction rate (transport) of species between the arterial compartment and the other tissue compartments in symbiology?

Is acetylcholine found in brain, Q. Is Acetylcholine found in brain? Ace...

Q. Is Acetylcholine found in brain? Acetylcholine is found in many parts of the brain having particularly high concentrations in the cerebral cortex, limbic system, basal, foreb

Explain root pressure, Explain root pressure? How can you demonstrate it ex...

Explain root pressure? How can you demonstrate it experimentally? What is the cytological basis of Down's syndrome? Give two physical symptoms of this disorder. Describe why the

Phylum ceolentrate, Compare and contracte the phylum of ceolantrat

Compare and contracte the phylum of ceolantrate

Conduct of perfusion-cardio pulmonary bypass, Conduct of Perfusion :  At t...

Conduct of Perfusion :  At the beginning of the bypass, the pump output is usually kept at 2.4 litres per meter per minute. On coming off bypass, the flow is gradually reduced til

Enumerate the number of converging developments, Enumerate the Number of co...

Enumerate the Number of converging developments These include: 1) A better definition of the unique developmental concepts that are applicable to infants and young children,

Mode of nutition, What is the mode of nutrition of Ascaris?

What is the mode of nutrition of Ascaris?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd