Marks
k
7. A termite population was sprayed with a certain brand of insecticide, a poison that kills
termites. After being sprayed, the number of surviving termites within the population were
counted and recorded as percentage of the total. This process was repeated until a total of six
generations of termites had been sprayed. The results are shown in the table below.
1
5%
2.
10%
3
25%
4
40%
5
60%
6
80%

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.

Which three statements represent the benefits of performing experiments using computer simulations?

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .