grading

Directory

References

Discover

David Cameron. President Barack Obama and Prime Minister David Cameron of the United Kingdom talk during the G8 Summit at the Lough Erne Resort in Enniskillen, Northern Ireland, June 17, 2013

What’s the Difference Between a President and a Prime Minister?

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

Election - Button that says Vote. Badge pin stars and stripes politics campaign

Why Are U.S. Elections Held on Tuesdays?

United States elections portal page linking to each election interactive

A History of U.S. Presidential Elections in Maps

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Globe South America, map

What’s the Difference Between Hispanic and Latino?

grading

genetics

Learn about this topic in these articles:

backcross

In backcross
Grading usually refers to the mating of average, or “grade,” females to a superior male, then backcrossing the female offspring to the same or a similar sire.
Read More