The disease, sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA). Individuals with severe sickle-cell anemia (SS) usually die before reproduction. If this population moves to an area without malaria, what will happen to the allele frequency of the A allele over time?
A. It will go up because there is no sickle cell anemia.
B. It will go down because there is no malaria.
C. It will go down because there is no sickle cell anemia.
D. It will go up because there is no malaria.
D. It will go up because there is no malaria.
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How many distinct aminoacyl-tRNA synthetases does each cell make?
A. ~1 B. ~20 C. ~60 D. ~120 E. ~180
Crossing over occurs during
a. anaphase I. b. metaphase II. c. prophase I. d. prophase II. e. telophase II.
The almost complete loss of the American chestnut tree to the chestnut blight fungus had __________
ecological impact on the moderately diverse Appalachian woodlands of which it was formerly a part. a. little b. great c. moderate d. undetectable e. detectable.
The American kangaroo rat is characteristic of the desert biome. Indicate whether the statement is true or false