Cells in the G0 stage
A) have two chromatids per chromosome.
B) are replicating their chromosomes.
C) are about to enter the mitotic phase of the cell cycle.
D) are in an extended G1 phase and no longer dividing.
E) are dead.
D) are in an extended G1 phase and no longer dividing.
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The island fox, Urocyon littoralis, is only found on the Channel Island off the coast of California. This species is not found on the mainland where the gray fox, Urocyon cinereoargenteus, lives. This species would be considered to be
A. extinct. B. a transitional form. C. endemic. D. exotic. E. an ancestral form.
A maternal effect mutation bicoid (bcd) is recessive. The bcd allele makes no Bicoid protein. In the absence of the Bicoid protein, product embryogenesis is not completed and eggs fail to hatch into viable larva
Consider a cross between a female who is heterozygous (bcd+/bcd) and a homozygous mutant male (bcd/bcd). a. How is it possible for a male homozygous for the mutation to exist? b. Predict the outcome (normal and/or failed embryogenesis) in the F1 and F2 generations resulting from this cross.
In contrast to the excretory system of annelids, the excretory system of insects:a
has many openings on the body wall. b. contains flame cells. c. is not connected to the gut. d. excretes uric acid from the rectum. e. relies on diffusion across the body wall.
Which of these is not considered a difficulty with the biological species concept?
A. fossil species B. inbreeding species C. asexual species D. ring species