Flatworms ________.
a) are segmented worms like earthworms and leeches
b) have radical symmetry
c) are the simplest animals with organs and organ systems
d) have an exoskeleton and paired jointed appendages
Ans: c) are the simplest animals with organs and organ systems
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Which eye type produces images with the greatest resolution?
A. eyecups B. compound eyes C. single-lens eyes D. multiple sets of compound eyes
The overall ecological efficiency of most organisms is between
a. 1 and 2 percent. b. 2 and 5 percent. c. 5 and 20 percent. d. 10 and 50 percent. e. 50 and 75 percent.
Strong selection against the phenotypes for both homozygotes
a. reduces the equilibrium frequencies of the homozygous genotypes b. completely eliminates the homozygous genotypes c. has no effect on the homozygous genotypes
The fact that freckles tend to be inherited with red hair is counter to which of Mendel's assertions?
a) A single phenotype is dictated by two genes carried in each cell. b) There are only two alleles possible for a trait. c) Genes for different traits sort independently of each other. d) One allele is always fully dominant over another. e) Two copies of genetic instructions are carried per cell for a given characteristic.