by MoonfallTheFox » Sun Mar 25, 2012 11:12 am
Again. Ear location is linked to only one gene. You either have homozygous (2 genes) for dumbo, or you have a standard eared rat. A heterozygous (one of each allele) rat will show the dominant trait, in this case, standard ears. You have only two options. Dumbo or standard. Your rat is homozygous for dumbo, meaning he is a/a. If he had standard ears he would be either A/a or A/A. If you cross two standard rats who are heterozygous (A/a), then you will get a litter that is 1/4 dumbo ears. If you cross a dumbo rat (a/a) with a heterozygous standard rat (A/a), you will get a litter that is half dumbo and half heterozygous standard.
A dumbo rat can have different ear shapes, but he is NOT a mix! He is still a/a, regardless of whether one parent was standard ear (heterozygous) or not. The ear shapes are, I assume, caused by modifiers or linked alleles, which I don't understand very well. However, modifiers or no, your rat has the genetic makeup that makes him a dumbo rat. To have "both" genetically, the rat will have standard ears, but be a dumbo carrier.
The two types can breed because all it is is ONE gene. For example (I do not know human genetics so bear with me), say a blonde is C/C, and a person with black hair is c/c. These people could have a baby, hair type does not affect that. The phenotype (physical appearance) of an animal does not mean it is a different type of animal altogether and can't breed. They CAN breed, but you are going to get whatever the genetics code for. If the blonde has a baby with the other person, they will both pass on ONE gene (gametes only carry half of a genotype, selected at random. Egg/sperm are gametes). In this case, the baby would be blonde, but a carrier for black hair. The baby does not have black hair, and is not a "mix". The baby shows blonde hair, just like your rat shows dumbo ears. (Dumbo is recessive, however, and in this example blonde hair is dominant).
Last edited by
MoonfallTheFox on Sun Mar 25, 2012 11:17 am, edited 1 time in total.
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