A student argues that Mendel must have seen genes on chromosomes because he concluded that inherited units remained unchanged. The student also argues that the later discovery of DNA structure made the breeding results unnecessary.
Which evaluation correctly addresses both arguments?
Mendel observed chromosomes before proposing inherited units; DNA structure later supplied an independent replacement for his breeding evidence.
Mendel inferred inherited units after DNA structure was established; chromosome observations later confirmed their behaviour alongside breeding evidence.
Mendel inferred inherited units before chromosome links were established; DNA structure later explained their material basis alongside breeding evidence.
Mendel observed inherited units before DNA structure was established; chromosome observations later supplied an independent replacement for breeding evidence.
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.