You begin an experiment with two populations of E. coli that are each composed of 100 cells. The cells are all genetically identical (i.e., they are clones)
You grow these populations in
flasks on a lab bench under identical conditions with unlimited resources. Which of the
following statements about the populations are true?
____ Natural selection begins operating immediately on the populations.
____ Initial differences in population will be adaptations to the new environment.
____ Initial differences in the population will be the result of sexual selection.
____ Initially mutation will be the only source of variation in the population.
____ Initially these populations will be in H-W equilibrium.
____ Speciation cannot occur because the two populations are identical.
____ After 100 generations both populations will still be genetically the same, having
accumulated the same mutations over time.
____ Natural selection cannot occur because bacteria are haploid, so there is no individual
variation.
____ Speciation can only occur after there is enough variation in the population for natural
selection to act upon.
____ Speciation can occur between these populations through genetic drift alone.
What will be an ideal response?
f Natural selection begins operating immediately on the populations.
f Initial differences in population will be adaptations to the new environment.
f Initial differences in the population will be the result of sexual selection.
t Initially mutation will be the only source of variation in the population.
f Initially these populations will be in H-W equilibrium.
t Speciation cannot occur because the two populations are identical.
f After 100 generations both populations will still be genetically the same, having
accumulated the same mutations over time.
f Natural selection cannot occur because bacteria are haploid, so there is no individual
variation.
f Speciation can only occur after there is enough variation in the population for natural
selection to act upon.
t Speciation can occur between these populations through genetic drift alone.
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Complex traits are often called _____ because they _____
A. qualitative; come in one of several discrete (distinct) forms. B. external; are influenced by the environment as well as by genes. C. quantitative; are described by measurements. D. epistatic; are influenced by many genes. E. environmental; are influenced by the environment as well as by genes.
Olfactory neurons first transmit their action potential to the central nervous system structure called the
A. amygdala. B. olfactory bulb. C. cerebellum. D. accessory olfactory bulb. E. cerebral cortex.
A(n) ________ is an animal whose predation on other species has major effects on the structure of the biological community
Fill in the blank(s) with correct word
If a virus enters the lytic phase in a host's cell, it will cause the host cell to
A. reject the virus. B. initiate an attack on the virus. C. lyse due to the action of enzymes. D. replicate itself at a higher than normal frequency. E. shrink because of the loss of cytoplasm that has been used in the synthesis of viral DNA.