Mutations result when a change occurs in DNA. These changes can be caused by environmental factors, deletion of a nucleotide, addition of a nucleotide, or substitution of a nucleotide within a
DNA base sequence.
Which of the following correctly describe a mutation?
[Select ALL that apply]
ASilent mutations will not have an effect on the organism.
B. Mutations must be passed from parents to offspring through the basics of heredity.
Mutations are the cause of variation among species.
D Beneficial mutations cannot be passed through generations.
E Fatal mutations have led to the develonment of n
Moo

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?