A scientist in 1866 asks what Mendel's inherited units are made of and where they are located.
Which statement correctly links a limitation at that time with a later discovery?
Mendel had identified DNA, but later work showed that DNA was organised into chromosomes.
Mendel had identified chromosomes, but later work showed that chromosomes carried inherited units.
Mendel had inferred inherited units, but later work linked those units with observed chromosomes.
Mendel had observed dividing cells, but later work showed that inherited units blended together.
40 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.