What are some examples of codominance?

Answer 1

a cow with white hairs and a cow with black hairs mate and produce a cow with both white and black hairs. apex

Answer 2

co-dominence is like a punnet square you use PP or pp

Answer 3

In genetics, codominance occurs when neither gene is dominant over the other. In this case, the traits will both show in the observable characteristics (phenotype).

Some examples of codominance are the following:

• Blood type - Type AB is codominant because both the antigen A and antigen B show up in the genotype.
• Cats - If a black cat and tan cat mate, the kitten will have both black fur and tan fur.
• Dogs - If a dog with white fur and a dog with black fur mate, they produce a dog with both white and black fur.

Answer 4

I have been trying to find a more satisfying answer to this question every year when I teach genetics in the Biology classes I teach. I feel I have a pretty strong understanding of the functional distinction between incomplete dominance and codominance but it's not clear that one or the other can always be unambiguously invoked as explaining a given combination of F2 phenotypes without knowledge of the underlying molecular effects. One clear example of codominance is the ABO blood system where A and B are codominant to each other and each is also completely dominant to the allele for O-type blood. The MN blood group is another example. A more visible example which is often given is that of the "roan" condition in horses and cows where some hairs are white and some are brown or black. I'm not convinced this is truly codominance as white hairs would signify the absence of pigment (no gene expression) it seems.

I've visited several other similar forums and every time this question is asked, it gets the same (often wrong) answers or isn't answered at all. If you check out the wikipedia entry on "dominance" and follow the link at the top to the discussions about the accuracy of the content, you will find that this matter is not as easy to resolve as you might think from the impression given by your average introductory biology textbook. At a functional level, incomplete dominance is the result of a dosage effect where the heterozygotes have an intermediate phenotype because they have only one allele making gene product and half as much product gives you a trait whose expression is half as strong as one of the homozygotes (the other allele doesn't contribute anything - I think - because it doesn't express a product). With codominance, both alleles get expressed and even though heterozygotes may have half as much gene product from each allele as each of the homozygotes has, that dose is sufficient for full functional expression of both alleles. So, it seems that the only way to tell for sure is to investigate the molecular effects of the alleles. Perhaps this is why the only (to me) clearcut cases of codiminance are those in which the gene product itself is what gets scored (you can have A or B blood antigens or both).

Good luck!

Answer 5

The most well known example of codominance is blood type. Both type A and B are equally dominant. A person can have AA or BB or AB. An other is the roan color of fur in cattle. Both Red and White are expressed. Other examples of codominance in animals include, horses, agouti mice and tabby cats

Answer 6

One example of codominance is blood type, where individuals with both A and B alleles will have type AB blood. Another example is the coat color of some cattle, where animals with both red and white alleles have a roan coat pattern.

Answer 7

A good example of codominance is the roan coat seen in some cattle and horses. Another example would be the color and pattern mutation of the Pastel phase ball python.

Answer 8

co-dominence is like a punnet square you use PP or pp