In a population of ladybugs, a change in DNA of the offspring of one bug produces entirely black bugs. These bugs are more successful in escaping predators. Overtime, this gene becomes more frequent in the population, and the ladybug population loses its red color allele. What type of evolutionary mechanism caused the change in the population?

Missing options

A. Gene flow

B. Genetic drift

C. Artificial selection

D. Mutation

B. Genetic drift

Explanation:

The loss of particular gene as a result of death of indivduals carrying those genes is known as genetic drift. As per the question statement, a change in DNA of ladybugs produced black bugs that were more successful in escaping predators. Therefore, with the passage of time, all other individuals that do not carry this gene (rather carry red color allele) would be eaten by the predators and only black bugs would survive. This phenonmenon is known as genetic drift.

This is not a gene flow because changed gene is not being transferred. Similarly, it is a natural selection and not artificial selection where humans introduce changes. However, the change in DNA could be regarded as positive mutation. But we cannot call the whole phenomenon as mutation because it also includes selection of black bugs. So, only genetic drift is the correct option.

answer; //the above statement is (false);

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.