Which of the following scientists did not contribute to the development of genetics?

Analyze the question: We need the scientist who is NOT associated with the development of genetics.

Explain the concept: Genetics developed through the work of several key scientists:

• Gregor Mendel (D): the "Father of Genetics." He used pea plants to establish the laws of inheritance (segregation and independent assortment).
• Thomas Hunt Morgan (C): used fruit flies (Drosophila) to show that genes are located on chromosomes. He worked out sex-linked inheritance and won a Nobel Prize.
• Wilhelm Johannsen (A): coined the terms "gene," "genotype," and "phenotype."
• Félix Dujardin (B): a French biologist known for his work on protozoa and for describing sarcode (what we now call protoplasm/cytoplasm). He is linked to cell theory and microbiology, not genetics.

Solution: Compare each person's contribution:

| Scientist | Contribution | Genetics? | |---|---|---| | Johannsen | Terms gene, genotype, phenotype | Yes | | Dujardin | Protozoa, sarcode (protoplasm) | No | | Morgan | Chromosome theory, sex linkage | Yes | | Mendel | Laws of inheritance | Yes |

Correct answer: B. Felix Durjadin (Dujardin)

Tip: Link each name to a keyword:

• Mendel = peas
• Morgan = fruit flies
• Johannsen = "gene" (naming)
• Dujardin = protoplasm and cells

If a name sounds unfamiliar in a genetics question, it often belongs to cell biology instead.