What is it called when members of the same species vie for the same resources?
a. interspecific competition
b. predation
c. intraspecific competition
d. commensalism
c. intraspecific competition
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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?
In science, a theory is defined as
a. a speculative guess. b. a hypothesis. c. an explanation that is well documented and consistent with the evidence. d. a description of a phenomenon for which there is no explanation. e. a personal conviction.
Explain why geneticists believe that almost all chromosomally abnormal embryos and fetuses are eliminated as
pregnancy progresses. What will be an ideal response?
The type of mutation that alters the nucleotide sequence of a gene but does not alter the amino acid sequence of the protein produced from that gene is called ________ mutation
A) missense B) silent C) nonsense D) frameshift