All living things have DNA. Trees are plants. All plants pass their DNA down to the next generation. The plant kingdom can reproduce sexually, similar to animals, by producing seeds. Seeds are made when the stamen (male part of a flower) produces pollen grains (similar to sperm in animals). The pollen then attaches to the stigma on top of a carpel, which contains ovules (the female part). In this case, the DNA of the plants that grows out of the seeds is a mixture of both separate parent plants. Some plant species can actually pollenate themselves, which means that the DNA is extremely similar to the single parent plant.
And then there are ways that plants can reproduce asexually. For example, many bulbs can be cut in half to form two new plants. In this case, the two new plants share identical DNA.
I don’t know if I can make an entire course in plant biology any simpler than that, but yes, plants definitely have DNA and parents, even if the parents are themselves.
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