Among the bryophytes, which of the following contain distinct stemlike axis, small leaves, and rootlike rhizoids?
A. liverworts
B. hornworts
C. mosses
D. algae
E. cycads
C. mosses
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What is this phenomenon called and what affect does this mutation have on
GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG.
A. directional selection; that has resulted in genetic uniformity in the species.
B. a bottleneck effect; decreases the number alleles in the population.
C. stabilizing selection; that reduced genetic diversity within the species.
D. adaptive variation; resulting in reduced genetic diversity in females because the GGC coded for bright feather color instead of the mottled brown feather color coded for by GGG.
E. neutral variation; the change in genetic code does not cause a change in phenotype therefore there is no change in reproductive success. This mutation then does not affect the population.
Which term describes the front side of an animal displaying bilateral symmetry?
a. anterior b. posterior c. ventral d. dorsal
Which statement is true?
a. broadcast spawning produces a high percentage of surviving eggs b. broadcast spawners participate in elaborate courtship behaviors c. the offspring of broadcast spawners are vulnerable to predators d. broadcast spawning requires organisms to travel long distances
The urethra ________.
A. is a structure where semen is stored B. adds fluids to semen C. is where sperms are produced D. is a tube that conveys both urine and semen