In pea plants, yellow seed color (Y) is dominant to green seed color (y). Two yellow plants of unknown genotype are crossed. The resulting F1 generation has a 3:1 phenotypic ratio of yellow to green seeds. What must be the genotypes of the parent plants for this cross?

Which properties describe all matter?

Which blood cell spend most of their time in the lymphatic system?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of