Many amphibian populations have been decimated by a parasitic fungus classified as a member of the _____
A) Chytridiomycota
B) Ascomycota
C) Basidiomycota
D) Zygomycota
E) Glomeromycota
Answer: A
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When a single-gene mutation can have phenotypic effects at multiple stages of development, it is
A. pleiotropic. B. incompletely dominant. C. recessive. D. causing a disease. E. codominant.
The sex of the fruit fly Drosophila melanogaster is determined as follows: XX chromosomes give a female and XY give a male. The gene for bar eyes is recessive and located on the X chromosome. If two bar-eyed flies are mated, what percentage of the offspring will have bar eyes?
A. none B. 25% C. 50% D. 100%
The three nonsense codons that do not code for any amino acid; UAA, UAG, and UGA are also known as:
a) stop codons. b) start codons. c) transverse codons. d) secondary codons. e) degenerate codons
Birds hatch out of their eggs looking like small versions of the adult. This is an example of
A) genetic dwarfism. B) internal development. C) indirect development. D) direct development. E) external development.