Question

calhoun, miya
meloss and genetic var quiz
sickle cell anemia is a genetic condition that occurs because of a single point mutation in the dna gene for hemoglobin. how is this mutation expressed in humans?
the carbohydrate coded by the dna has a different structure.
the chromosome carrying this gene changes shape during cell reproduction.
the hormones in the blood are changed by increased differences in genes.
the protein coded by the dna has a different amino acid sequence.

Explanation:

Sickle cell anemia is caused by a mutation in the DNA gene for hemoglobin. DNA codes for proteins. A single - point mutation in the DNA (a change in the nucleotide sequence) leads to a change in the amino - acid sequence of the protein (hemoglobin in this case).

• Carbohydrates are not coded by the DNA gene for hemoglobin. DNA primarily codes for proteins.
• The mutation is a point mutation (a change in a single nucleotide) and not a change in the chromosome's shape during cell reproduction. Chromosomal mutations are larger - scale changes like deletions, duplications, etc., which is not the case here.
• Hormones are not directly related to this mutation. The gene in question codes for hemoglobin (a protein), not a hormone.

Answer:

The protein coded by the DNA has a different amino acid sequence.