Which is potentially a pathogen?
a. acid rain
b. toxic chemicals
c. chlorine
d. a virus

Which of the following substances is not involved in the chemical reaction that pro- duces smog? a. sunlight b. particulate matter c. automotive exhaust d. ozone

German cockroaches, bulging eyes, bu, are recessive to normal eyes, bu , and curved wings, cv, are recessive to straight wings, cv . both traits are encoded by autosomal genes that are linked. a cockroach has genotype bu bu cv cv, and the genes are in repulsion. which set of genes will be found in the most common gametes produced by this cockroach?

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome