If a pedigree shows heterozygous individuals are unaffected, then the disorder is likely _____.Group of answer choicesdominantrecessiveNext

Analysis of the Pedigree

1. Understanding Heterozygosity: In genetics, a heterozygous individual carries two different alleles for a particular gene. For traits related to disorders, this means one allele may be normal (let's denote it as "A") and the other may be mutated (denote it as "a").

2. Signs of Dominance and Recessiveness:

   • Dominant Disorders: If a disorder is caused by a dominant allele, individuals with at least one dominant allele (AA or Aa) will express the disorder. Hence, heterozygous individuals (Aa) would be affected.
   • Recessive Disorders: For recessive disorders, an individual needs to have two copies of the recessive allele (aa) to express the disorder. Thus, heterozygous individuals (Aa) would be unaffected.

3. Conclusion: Given that the pedigree shows heterozygous individuals are unaffected, it suggests that the disorder in question requires both alleles to be recessive (i.e., individuals must be homozygous recessive, aa, to express the disorder).

Final Answer

The disorder is likely recessive.