Part 2: Monohybrid Cross. How much genotypic variation do you find in the randomly picked parents of your crosses? How much in the offspring? How much phenotypic variation? Is the ratio of observed phenotypes the same as the ratio of predicted phenotypes? Why or why not? Pool all of the offspring from your five replicates.
answer 2. The combine harvester, or simply combine, is a machine that harvests grain crops. The first harvesting machines were devised by Patrick Bell in Scotland and Cyrus Hall McCormick in the United States. McCormick invented his first reaper at the age of 22 and tested it in a neighbor's field in 1831.he first harvesting machines were devised by Patrick Bell in Scotland and Cyrus Hall McCormick in the United States. McCormick invented his first reaper at the age of 22 and tested it in a neighbor's field in 1831.
In the mid-60s, engineer, Buster Peterson (brother to founder) designed and built tandem and triple 657 scraper machines to meet the demands of moving more dirt, faster. The results were mixed but they made history for Peter Kiewit on their portion of the San Luis Canal down in California's Central Valley.Further south, Guy F. Atkinson was working their 15 mile stretch with tandem and triple LeTourneau electric scrapers.hey hauled more dirt; they moved faster; they just did a better job with less down-time, recalls retired Peterson field service veteran, Vern Renwick. Jerry Bennett, Operating Engineer Local 3 President (mid-90s) was one of the Triple's operators during the 1965-66 season, hand-picked by Peterson.