________ has the same optical qualities as glass and thus prevents refractive loss of light as it passes from the slide to the objective lens.
Fill in the blank(s) with the appropriate word(s).
Immersion oil
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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.
How does reduced river connectivity affect aquatic species?
a. It helps nonnative species establish in certain ecosystems. b. It prevents species from migrating freely. c. It reduces water temperature. d. It increases river volume. e. It assists species in long migrations.
Memory cells "remember" the antigen and make a faster and greater response the next time the antigen is encountered.
a. true b. false
Genetically modified crops have been produced mainly to benefit:
A) the scientific community. B) consumers. C) farmers. D) the United State's ability to export agricultural products.