The frequency of the allele that causes sickle cell disease is higher in some populations than in others because
A) the gene mutates at different frequencies in different parts of the world.
B) the incidence of malaria differs in different parts of the world.
C) sickle cell disease screening is better in developed countries.
D) heterozygotes are resistant to cholera.
B) the incidence of malaria differs in different parts of the world.
You might also like to view...
Angiosperms possess many adaptations. Which of the following statements is not true of angiosperms relative to other groups of plants?
A. Angiosperms have xylem vessels. B. Angiosperms rely entirely on tracheid xylem. C. Angiosperms have much higher rates of CO2 uptake than other groups of plants. D. Angiosperms transformed the terrestrial environment due to their metabolic activities. E. Angiosperms can support greater rates of photosynthesis and transpiration than other groups of plants.
Assuming one glucose molecule being metabolized, what is the net yield of ATP in the cell under aerobic conditions?
a. 1 b. 2 c. 32 d. 34 e. 36
A plasmid is extrachromosomal, circular DNA with an origin of replication (allows replication) and often contains genes for antibiotic resistance, metabolism of unusual molecules (e.g., Pseudomonas) or virulence.
a. true b. false
What type of flower should you plant in your garden if you are particularly interested in attracting butterflies?
A. Purple, tubular-shaped flowers with a light floral scent. B. Pendulous red flowers that are open day and night with no scent. C. White day-blooming flowers with abundant pollen and a strong floral scent. D. Yellow flowers with abundant pollen and nectar and a strong floral scent. E. White, night-blooming flowers with a strong floral scent.