How do u determine if u r heterozygous or homozygous for a dominant trait?
Look at your parents, and the way the gene works. Basic rules: 1. You show the recessive version. You are homozygous for the recessive version–that’s the only way this can happen. 2. You show the dominant version. You could be heterozygous or homozygous for it–you don’t know yet. 3. You show the dominant version, and one parent shows the recessive version. You have to be heterozygous–that parent gives you the recessive copy, and the other parent gives you the dominant copy. 4. You show the dominant version, and both parents show the recessive version. There is no way to know if you are heterozygous or homozygous. You don’t know if your parents are carriers of the recessive version, so you don’t have any way to know if you’re a carrier. Take the example of having a cleft chin. You either have one or you don’t. Cleft chin is dominant, no cleft chin is recessive. If you don’t have one, you KNOW that you are recessive, and you’re homozygous. Homozygous means “two of the same copies of a
