The structure in the accompanying figure labeled ____ is characteristic of the phylum to which this organism belongs
a. brain
b. mouth
c. heart
d. notochord
e. anus
d
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What information is used to calculate the age-specific fertility rate, mx?
A. net reproductive rate B. total number of offspring born to females of reproductive age C. per capita growth rate D. proportion of female offspring born to females of reproductive age E. age at first reproduction
Which of the following combinations correctly matches a phylum to its description?
A) Echinodermata — bilateral symmetry as a larva, water vascular system B) Nematoda — segmented worms, closed circulatory system C) Cnidaria — flatworms, gastrovascular cavity, acoelomate D) Platyhelminthes — radial symmetry, polyp and medusa body forms
A pedigree is useful because it ________
A) shows the genotype of a particular individual B) can help predict the chances of an offspring displaying a particular trait C) can look at multiple traits at one time D) shows the phenotype of one individual
Alternative exons can arise through the duplication and divergence of existing exons. What type of mutation below would be least tolerated during the evolution of a new exon?
(a) a nucleotide change of A to G (b) a deletion of three consecutive bases (c) mutation of the first nucleotide in the intron (d) a nucleotide change that alters a TT dinucleotide to AA