When DDT was first introduced, insects were
very susceptible to it. The development of
resistance to DDT by insects was the result of
a. special creation.
b. natural selection of forms that expressed
genes for resistance.
c. the high biotic potential of insects.
d. a naturally occurring example of
inheritance of acquired characteristics.
e. mutation induced by DDT
B
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Answer the question using the accompanying figure. The variable region of a light chain is indicated by number____
a. 1 b. 2 c. 3 d. 4 e. 5
Which of the following can be mutated to result in constitutive expression from the lac operon?
A) lacZ and lacP B) lacZ and lacI C) lacO and lacI D) lacO and lacZ E) lacI and lacY
Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder?
A.) 25% B.) 50% C.) 75% D.) 100%
When a cell loses control over its replication cycle, _____.
A) the cell can divide over and over with no interphase B) the cell may not die as it is supposed to C) damaged chromosomes may be replicated D) all of the choices