Two sets of research findings were reported at different times.
Early 1900s: The behaviour of chromosomes during cell division matched the expected behaviour of the units controlling inherited characteristics.
Middle 1900s: The structure of DNA was worked out, helping scientists to explain how genes do their job.
Which statement is supported by these findings?
The location of genes could not be proposed until the structure of DNA had been worked out.
The chromosome evidence was sufficient to place genes on chromosomes before scientists understood the structure of DNA.
Working out the structure of DNA replaced the conclusion that genes are located on chromosomes.
Each chromosome was shown to control only one inherited characteristic because it moved like an inherited unit.
71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.