Diffusion of morphogens--products of master genes--creates gradients that cause the differential
expression of other genes such as __________, which govern the formation of specific body parts. Fill in the blank(s) with the appropriate word(s).
homeotic genes
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The sum of all gene copies at all gene loci in all individuals in a population defines a ____
a. ploidy level b. genome c. polymorphism d. gene pool e. genetic database
Which of these statements is true?
a. Environment can readily alter some genotypes. b. Genotype is manifested in phenotype. c. Genetic variation is easier seen than phenotypic variation. d. Variation dies with individuals. e. Phenotype is seen physically in the genotype.
Pain projected by the brain back to a missing body part is called
a. phantom pain. b. referred pain. c. projected pain. d. erroneous pain. e. perceived pain.
Some of the most dramatic evidence for evolution has come from human agriculture. One of the most highly artificially selected crop plants is
A. asparagus. B. corn. C. potatoes. D. peas. E. tomatoes.