Tomato Size (IMAGE) Howard Hughes Medical Institute Caption Researchers showed that structural variation, in this case the number of copies of a gene, can alter fruit. Plants with three gene copies (left) grew fruit 30 percent larger than those with one (right). Credit Credit: M. Alonge et al./Cell 2020 Usage Restrictions Must use credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.