During which of the following stages do cells of identical genetic makeup become structurally and functionally different from one another according to the genetically controlled developmental program of the species:
a. cleavage
b. cell differentiation
c. morphogenesis
d. metamorphosis
e. ovulation
Answer: b. cell differentiation
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The following is not a common feeding type in rocky intertidal areas:
a. filter feeding. b. scavenger. c. grazer. d. deposit feeding. e. carnivore.
Biogeography is the study of
a. the distribution of land masses. b. the patterns in the geographical distribution of species. c. the patterns of species dispersal. d. the pattern of population demographics. e. none of these
Chromosomes of a pair of homologous chromosomes
may differ from other chromosomes in terms of a. size. b. shape. c. the alleles they carry. d. the position of the centromere. e. all of these.
In controlled experiments, researchers study a(n) ____________________ variable and compare the results to those of
the control group. Fill in the blank(s) with the appropriate word(s).