What would happen to the HS allele if a vaccine for malaria was 100% effective?
The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria.
. The HS allele would increase in frequency in populations where malaria was present.
B. The HS allele would decrease in frequency in populations where malaria was present.
C. There would be no change in frequency between the HS and HA allele.
D. Negative frequency-dependent selection would occur and there would be a balanced frequency between the two alleles.
E. The frequency of homozygous individuals would decrease and the heterozygous individuals would increase.
B. The HS allele would decrease in frequency in populations where malaria was present.
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a. selects against plasmids containing human DNA fragments.
b. selects for plasmids containing particular DNA fragments.
c. selects for bacteria containing plasmids.
d. selects for bacteria lacking plasmids.
e. prevents contamination of the medium
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Fill in the blank(s) with correct word
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What will be an ideal response?