Question

which type of mutation causes sickle cell anemia?
missense
insertion

Explanation:

Sickle cell anemia is caused by a missense mutation. A missense mutation is a type of point mutation where a single nucleotide change results in a codon that codes for a different amino acid. In sickle cell anemia, a single base substitution in the gene for hemoglobin leads to a change in one amino acid in the hemoglobin protein, causing the abnormal sickle - shaped red blood cells. Insertion mutations involve adding one or more nucleotides into a DNA sequence, which is not the case for sickle cell anemia.

Answer:

missense