Just like humans, plants get their chromosomes, or DNA, from their parents.
Plants reproduce sexually through pollination. Pollen from the male part of a plant contains genetic information that combines with genetic information in the ovule, or female part, of another plant. When the pollen combines with the ovule, fertilization occurs and a seed is created. In corn, pollen is located on the tassel at the top of the plant and is spread primarily by wind. The pollen from one plant needs to travel to the silk of another plant--this is called cross-pollination.
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