Source: GENETIC LITERACY PROJECT, 11/9/20


Sally Mackenzie spent her childhood summers walking through the vast fields of bright, red, ripe tomato crops: They grow best in the heat of her home state of California. Yet recent seasons prove it can get too hot for a tomato. “It just sits there, puts out these little green knobs, and won’t do anything with them, because it just can’t handle the heat,” says Mackenzie, now a professor of biology and plant science at Penn State University in University Park.

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