You are studying a population of geese in which there are two color phases, brown and gray. Color in this species is controlled by a single gene, with brown dominant to gray. A random sample of 250 geese shows that 210 are brown. What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium.)
A. 48%
B. 57%
C. 36%
D. 43%
E. 84%
Answer: B
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Imagine that you are studying the control of ?-globin gene expression in immature red blood cells . (Mature red blood cells contain ?-globin protein but lack a nucleus and, therefore, the ?-globin gene.)
If you deleted a sequence of DNA outside the protein-coding region of the ?-globin gene and found that this increased the rate of transcription, the deleted sequence likely functions as _____. A) a promoter B) a promoter-proximal element C) an enhancer D) a silencer E) any of the listed functions
What mechanism leads to changes in allele frequencies due to random chance?
A. Genetic drift B. Natural selection C. Sexual selection D. Neutral variation E. inbreeding
Which agency is specifically responsible of the monitoring of disease and the implementation of prevention and control strategies in the United States?
A. Food and Drug Administration B. World Health Organization C. Department of Health and Human Services D. Centers for Disease Control and Prevention
Which feature is shared by euglenoids and
kinetoplastids? a. an eyespot b. a single flagellum c. photoautotrophy d. parasitic existence e. live in marine and freshwater habitats