Individuals who are affected by Sickle Cell Anemia have a mutation which leads to the production of valine instead of glutamic acid in a specific gene. The change in codons is shown as GAG to GTG. This is a mutation.

silent

nonsense

missense

frameshift

missense

Explanation:

Missense mutation is a type of mutation in which there is a change in a single nucleotide in a DNA sequence. It is a point mutation because only one single nucleotide is substituted or replaced by another. This change in a single nucleotide in a DNA sequence results to a change in the mRNA sequence produced from the DNA and this will lead to the incorporation of a wrong amino acid in the polypeptide chain of the protein. Missense mutation leads to a change in one codon in an mRNA which will lead to the production of a protein with an amino acid sequence that is different from the original protein. A missense mutation often leads to the production of a nonfunctional protein

d.

hope to be marked brainliest

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: