According to Dr. Wassenaar of Illinois, because genes code for the directions to make proteins and proteins have a wide variety of functions in the body, it is very important to have the right amount of kind of proteins and therefore the right genetic codes to make these proteins, but what if a gene is defective? Recessive genes tend to be defective in some cases, but sometimes you need both dominant and recessive genes to make a whole protein structure. So, a homozygous person would have strong structures and a person with heterozygous genes would have one gene that may not produce enough of the structure. Of course in not all cases are genes the end all determination of “effectiveness,” sometimes recessive genes just cause a difference and not a defect, as in the case of eye color or hair color, etc.
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