by heartleafed » Tue Mar 27, 2012 10:42 am
I think my mom might let me adopt two boy rats. I'm so happy. The youngest one's name is Gus, and he's actually a wild rat, but he was brought to his owner by a cat at two weeks old and has lived with people all his life, so he's really tamed. The other boy is a rescued feeder rat.
Now, as far as the ear thing goes, it is true that a dominant allele will mask a recessive, and it takes two recessive alleles to make certain features, but, there are cases of incomplete dominance, where it will take on characteristics of both, creating a mix (i.e.: a mixture of a red flower and white flower will create heterozygous red flowers with recessive white genes. In some cases, there will be pink flowers created due to the alleles not separating correctly). This occasions are not common, and are mutations that can occur regardless. You must also take into consideration all of the other genes affecting the ears in general, as well as their placement, shape, size, etc. I'm not sure how it works with rats though.
Even so, there are only two recognized ear types.
I'm not exactly an expert, but from my knowlege that's how it works.