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

What is the genetic code, The genetic code is the group of rules by that in...

The genetic code is the group of rules by that information encoded within genetic material DNA or mRNA sequences is changed into proteins (amino acid sequences) by living cells. Th

Ecology, importance of pyramid of energy to the ecologist

importance of pyramid of energy to the ecologist

What anatomical direction with respect to occipital cortex, The frontal cor...

The frontal cortex is in what anatomical direction with respect to the occipital cortex? a. anterior b. posterior c. sagittal d. inferior

What are the warning signs of implant failure, What are the warning signs o...

What are the warning signs of implant failure The warning signs of implant failure are: i). Connecting screw loosening. ii). Connecting screw failure. iii). Gingival b

What is shunts in congenital heart surgery, What is shunts in Congenital He...

What is shunts in Congenital Heart Surgery? Shunts : Blalock Shunts are connections between systemic arteries such as a subclavian arteiy with its respective pulmonary arteiy

What are the three main parts of a eukaryotic cell, What are the three main...

What are the three main parts of a eukaryotic cell? The eukaryotic cell can be divided into two major portions: the cell membrane that divides the intracellular space from the

Pathophysiology, The clinical  manifestations of IE result from the ...

The clinical  manifestations of IE result from the local destructive effects of intracardiac infection; the embolization of bland or septic fragments of vegetations to

What is the proper name for edta and what is it, What is the proper name fo...

What is the proper name for EDTA and what is it? EDTA is ethylenediamine tetraacetic acid. It is a tough chelating agent. It has many uses containing: 1) Industrial cleaning

What does ecological niche of an organism represent, What does ecological n...

What does ecological niche of an organism represent? Mention the scientific term used for modified form of reproduction in which seeds are produced without fusion of gametes.

Define the marasmic kwashiorkor, Define the Marasmic Kwashiorkor? In co...

Define the Marasmic Kwashiorkor? In countries where the incidence of protein-calorie malnutrition (PCM) is high, a large number of cases show signs and symptoms of marasmus and

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