One ancestral characteristic remaining in representatives of the Chytridiomycota is:
a. gametes formed by mitosis.
b. alternation of generations.
c. cell walls.
d. flagellated cells.
e. both sexual and asexual reproduction
D
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The evolution of saber teeth in a number of groups of extinct carnivorous mammals is an example of
A. homoplasy caused by convergence. B. homoplasy caused by common descent. C. homoplasy caused by evolutionary reversal. D. homology caused by convergence. E. homology caused by common descent.
The acrosome of a sperm cell contains ____
a. a haploid number of chromosomes b. a diploid number of chromosomes c. enzymes and other proteins
d. mitochondria e. ATP
Lichens, a combination of fungi and certain algae, live together in a close community interaction. The traditional understanding of lichen is one where the algae produces food for the fungi and the fungi supply the algae with a suitable home. Recently, however, it was found that the algae can live just fine on their own and are also found living "alone" in nature. The fungi on the other hand do
not appear to live on their own in the "wild." Which type of interaction characterizes the "traditional" understanding of lichen? Why? Which type of interaction does the new research suggest? Why? What will be an ideal response?
Structures that may be visible under the microscope and indicate where crossing over has occurred.
A. chiasma B. homologue C. kinetochore D. synapsis E. synaptonemal