Suppose that the health department of city A mounts a suc-cessful campaign to get children immunized against measles.Only 100 out of 10,000 children fail to receive the vaccine. Nowsuppose that city B, the same size as city A, has not carried out asuccessful measles vaccination program. Of the 10,000 childrenin city B, 5,000 had measles when the disease last struck thepopulation.(a) If a child with measles moves to city A, what is thechance that child will encounter a susceptiblechild?(b) If a child with measles moves to city B, what isthe chance that child will encounter a susceptiblechild?(c) Comparing the two scenarios, which city has thehigher herd immunity, and in which city is aninfected child more likely to transmit the diseaseto a susceptible child?
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.
Suppose that the health department of city A mounts a suc-
cessful campaign to get children immunized against measles.
Only 100 out of 10,000 children fail to receive the vaccine. Now
suppose that city B, the same size as city A, has not carried out a
successful measles vaccination program. Of the 10,000 children
in city B, 5,000 had measles when the disease last struck the
population.
(a) If a child with measles moves to city A, what is the
chance that child will encounter a susceptible
child?
(b) If a child with measles moves to city B, what is
the chance that child will encounter a susceptible
child?
(c) Comparing the two scenarios, which city has the
higher herd immunity, and in which city is an
infected child more likely to transmit the disease
to a susceptible child?
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