The person known to history as "Typhoid Mary" was identified by public health officials as a source of typhoid fever, although she reported she had never had typhoid fever. Which of the following is the most accurate description of her in this scenario?
A. contact carrier
B. human carrier
C. reservoir
D. both a human carrier and a reservoir
E. a reservoir but not a carrier
Answer: D
You might also like to view...
The science of classifying organisms is called
a. natural history b. taxonomy c. evolution d. morphology e. paleobiology
The best way to reclaim an ecosystem that is extensively damaged is to ____
a. allow natural succession to take over b. remove all predators from the area c. seed the area with a type of grass d. bring in beneficial insects e. implement ecological restoration
One characteristic of an autosomal dominant trait is that ____
a. 50% of individuals with two affected parents will be affected b. if two affected individuals are homozygous, the risk of having an affected child is 1:4 c. heterozygous fathers will always have affected daughters d. every affected individual has at least one affected parent e. mothers always pass the trait on to their sons
An F1 plant with the genotype DdGg is mated to a ddgg plant. The resulting seeds are planted and the following phenotypes produced in these numbers:
DG 47 Dg 396 dG 412 dg 55 a. What were the genotypes of the parental strains that produced the F1? b. What is the distance between the genes?