In the 1800s and early 1900s, farmers and scientists were just learning that cross-breeding corn caused heterosis, allowing farmers to grow more corn per acre of land farmed. Two different varieties of corn were crossed reciprocally: Variety A yielded 20 bushels per acre and Variety B yielded 25 bushels per acre, and the resulting hybrid progeny corn produced 27 bushels per acre. What is the percent heterosis?

What are some things that limit population growth?

Ateam from new york presbyterian hospital is conducting a study about a recent increase in cases involving both excess sweating and kidney stones. what would the team need before it draws a conclusion about the cases? medications that are specifically designed to treat the sickness machines that are built to process blood and reduce symptoms until patients are healthy again data that profile the various patients who report these symptoms proof that the excess sweating is related to the excessive kidney stones

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?