Barbara McClintock work showed that in maize

RNA transcribed from genes is report to form mature mRNA.

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Genes are stably located at specific sites of chromosomes.

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Certain genes move from one chromosome to another or within the same chromosome.

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Genes are exchanged between chromosomes during chiasmata formation.

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Solution

The correct option is D Certain genes move from one chromosome to another or within the same chromosome.
In the late 1940s, Barbara McClintock challenged existing concepts of what genes are capable of when she discovered that some gens could be mobile. Her studies of chromosome breakage in maize led her to the discover a chromosome-breaking locus that could change its position within a chromosome. McClintock received a number of prestigious award, including the 1970 National Medal of Science and culminating in an unshared Nobel Prize in Physiology or medicine in 1983.

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