Recessive,defective gene alleles can cause hereditary disorders.It is estimated that most people carry ______________ recessive,defective alleles in their genotypes.

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It is estimated that most people carry three to five recessive,defective alleles in their genotypes, which are usually harmless because they are paired with a dominant, non-defective allele. However, if both parents carry the same recessive, defective allele, there is a chance that their offspring may inherit two copies of the defective gene and develop the associated disorder.

Recessive,defective Gene Alleles Can Cause Hereditary Disorders