PLEASE HELP! What situation is an example of artificial selection?
Select one:
a. More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory.
b. Female bluegill fish prefer to lay their eggs in the nests of larger male fish.
c. Albino deer or rabbits have a low survival rate in nature, because it is easy for predators to spot them.
d. Penguins with higher body fat tend to survive nesting in the Antarctic winter, while leaner penguins often die.

A

Explanation: In artificial selection, humans determine what traits get passed down. For B, humans play no role in where the fish lays her eggs. For C, humans aren’t the ones killing the deer and rabbits — natural predators are. As a result, humans play no role. For D, humans also play no role in deciding which penguin lives.

For A, however, humans have caused African elephants to naturally lack tusks because of their hunting — this wasn’t natural or due to the environment. This was due to human intervention. As a result, it is artificial selection.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle