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Codominance
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Dr Praveen Kumar Agrawal is teaching live on Unacademy Plus

Dr Praveen Kumar Agrawal
Ex - Faculty, Allen Kota, 22 Yrs Experience. Author - 17 books Known for best explanation Youtube : Concept Gurukul

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Unacademy user
Resumed playing recently after over a year and half long gap. So this video certainly comes as music to my ears!
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sir please make video on multiple alleles
Sir the case of hybridisation for cow was same for flowers. So I can't get what basically is the difference between incomplete dominance and Co dominance ?
Tejeshwar Ahirwar
8 months ago
dekho kya ho ta ha in the case of incomplete dominance jab dominant aur recessive crossing hoti hai to na dominant so pata hai na recessive Wala balki ek Naya form ho jata hai for example in Four o clock plant jab Cross ek red or White KE beech mein hota hai tujhe result aata hai F1 generation ka to pure flower pink hote Hain aur jab hamein ki selfieing karte Hain tu ek red ek White aue 2 pink a te ha
Tejeshwar Ahirwar
8 months ago
aur codominance ka matlab kya hota dono allele aapni existence rakh te ha for example in cow with white and black patches
Tejeshwar Ahirwar
8 months ago
this both are exception of law of dominance
  1. COURSE Principles of inheritance and variations Lesson 12 A Critical evaluation of Mendel's Laws Co-dominance Dr. Praveen Kumar Agrawal M.Sc., Ph.D., CSIR NET (JRF). SRF, GATE 21Years of Pre-medical teaching experience


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  3. CO-DOMINANCE Co-dominance of alleles is another example against Mendel's principle of dominance. In some cattle, the inheritance of coat colour (skin colour) offers an example of co-dominance When some red coloured cattle (RR) are crossed with white coloured cattle (rr), the F1 hybrids have roan (Rr) colour (small patches of both colours simultaneously). According to Mendel's principle of dominance, F1 hybrids should be either red or white depending upon the dominant nature of red and white alleles.


  4. White Red F1 generation R r R r . Roan Roan Roan Roan


  5. Selfing of F1 individuals R r Roan Roan a o F 2 generation White Roan Roan Red


  6. On selfing, these F1 hybrids produce following results in F2 generations: F2 results Red-1, Roan-2, White-1 Therefore, in co-dominance, both alleles exist simultaneously. (Note there is no blending of character as in incomplete dominance). This type of inheritance where the two alleles of a character are equally dominant and exist simultaneously is called codominance. Other Examples of Co-dominance A and B blood group genes in human beings are also codominant. When present separately these genes form blood group A and blood group B respectively. But when present in heterozygous condition (present together in same gamete), they result in the formation of AB blood group. Similarly, in MN blood group system in humans, M and N alleles show codominance. In this case, the person has two alleles, one for M antigen (on RBCs) and other for N antigen (on RBCs). Person can have MM, MN or NN groups. In MN blood group case, both alleles are in heterozygous condition, and show co-dominance.


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