Four of the following five events shuffles existing alleles into different combinations in sexually reproducing
organisms. Which one is the exception?
a. changes in chromosome number
b. mutation
c. independent assortment of chromosomes
d. crossing over
e. fertilization
ANSWER: b
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Colonization of the body is inhibited by
A. the shedding of skin cells. B. the movement of mucus by cilia. C. peristalsis. D. the flushing action of the urinary tract. E. All of the choices are correct.
Social behavior occurs in groups, but not all groups display social behavior. Groups that display social behavior often have
A. some individuals doing one job and others in the group doing different jobs. B. long periods of contact between parents and offspring. C. elaborate methods of communicating among individuals in the group. D. All of these answers are true.
Prokaryotic cells are represented by fossils that are dated back as far as _____ billion years ago.
A. 1.5 B. 2.8 C. 3.8 D. 4.8
When mutation alters a gene, it may modify or even eliminate the encoded protein's usual ________ and cause an altered ________
A) structure; genotype B) function; genotype C) cell type; genotype D) function; phenotype E) ribosome; phenotype