MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Pea shape experiments. Hands holding two types of pea, with round ones at right and wrinkled ones at left. The question of why pea traits vary like this was investigated in the 19th century by Gregor Mendel, leading to an increased understanding of inheritance, a science now known as genetics.
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