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

Explain micronutrient, Which one of the following is not a micronutrient? ...

Which one of the following is not a micronutrient? 1. Molybdenum 2. Magnesium 3. Zinc 4. Boron. Magnesium

Explain the conveyor (or band) dryers, Explain the Conveyor (or Band) Dryer...

Explain the Conveyor (or Band) Dryers? In the conveyor (or band) dryer, the product is distributed on a moving belt, typically of a perforated plate, that passes through a tunn

Explain the limiting factors for the growth of a population, What are the m...

What are the main limiting factors for the growth of a population? The factors that limit the growth of a population can be divided into biotic factors and abiotic factors. The

Discuss the importance of septa in maxillary sinus, Discuss the importance ...

Discuss the importance of septa in maxillary sinus during a sinus lift or graft surgery. Septa, when present in the maxillary sinus will divide it into sections creating separa

How will this increase survival, Why would we evolve so that when we are st...

Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?

425, #questionThree actographs (look closely to see the labels A, B, and C)...

#questionThree actographs (look closely to see the labels A, B, and C). Assume that the abscissa is either 24 or 48 hours for each actograph. You are asked to write two sentences f

Illustrate the functioning of comprehensive model, Illustrate the functioni...

Illustrate the functioning of comprehensive model 1) Provide continuity in understanding developmental progress, or lack thereof, in those disorders that affect neurological de

Soil temperature, Soil Temperature Soil temperature is known to influe...

Soil Temperature Soil temperature is known to influence water absorption and ultimately transpiration to a considerable extent. In many plants water absorption is reduced shar

Enumerate the term - clinical neuroscience, Enumerate the term - Clinical n...

Enumerate the term - Clinical neuroscience Clinical neuroscience concerns the study of clinical populations both to well understand neuroanatomy and to test psychological theor

Explain the development of sirs or mods, Explain the Development of SIRS or...

Explain the Development of SIRS or MODS? Multiple hypothesis have been proposed to explain the development of SIRS or MODS. The progression of SIRS to MODS appears to be mediat

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