which statement is true of carriers? select all that apply.\na) they can pass a gene for a recessive…

which statement is true of carriers? select all that apply.\na) they can pass a gene for a recessive disorder.\nb) they have one dominant allele.\nc) they express the recessive trait.\nd) they are heterozygous for a recessive disorder.

which statement is true of carriers? select all that apply.\na) they can pass a gene for a recessive disorder.\nb) they have one dominant allele.\nc) they express the recessive trait.\nd) they are heterozygous for a recessive disorder.

Answer

Brief Explanations:

  • Option A: Carriers (for a recessive disorder) have one copy of the recessive allele, so they can pass it on. Correct.
  • Option B: Carriers of a recessive disorder are heterozygous (e.g., Aa for a recessive disorder where aa is affected), so they have one dominant (A) and one recessive (a) allele. Correct.
  • Option C: Carriers do not express the recessive trait (the recessive trait is expressed only in homozygous recessive individuals). Incorrect.
  • Option D: Carriers are heterozygous (have one dominant and one recessive allele) for the recessive disorder. Correct.

Answer: A) They can pass a gene for a recessive disorder, B) They have one dominant allele, D) They are heterozygous for a recessive disorder