A __________ is a type of __________ that exactly regenerates the original nucleotide sequence
a. second-site reversion; forward mutation
b. second-site reversion; back mutation
c. true reversion; forward mutation
d. true reversion; back mutation
e. substitution; point mutation
Ans: d
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Eukarya" is a _________.
Fill in the blank(s) with the appropriate word(s).
Where are microorganisms found in the ocean ecosystem? Describe the different zones of the ocean, their abiotic characteristics (e.g. temperatures, pressures, salt content, pH), and which types of organisms live there.
What will be an ideal response?
The convergence in external morphology of dolphins and tuna is attributed to
a. reduced genetic variability in these groups. b. selection pressures that are common to these groups. c. reproductive isolation of these groups. d. identical genes in all three groups. e. genetic mutation.
Balanced polymorphism can be maintained by the combined actions of:
a. the founder effect and genetic drift. b. heterozygote advantage and genetic drift. c. heterozygote advantage and the founder effect. d. frequency-dependent selection and the founder effect. e. heterozygote advantage and frequency-dependent selection