Mendel's Discrete Genes — Why Contemporaries Rejected His Theory
📚 Practice ConceptSecondly, his concept of genes (or factors, in Mendel's words) as stable and discrete units that controlled the expression of traits and, of the pair of alleles which did not 'blend' with each other, was not accepted by his contemporaries as an explanation for the apparently continuous variation seen in nature. Thirdly, Mendel's approach of using mathematics to explain biological phenomena was totally new and unacceptable to many of the biologists of his time. Finally, though Mendel's work suggested that factors (genes) were discrete units, he could not provide any physical proof for the existence of factors or say what they were made of.
Mendel studied traits showing continuous variation to demonstrate gradual blending of characters across generations.
Mendel studied DISCRETE (discontinuous) traits and treated genes as STABLE non-blending discrete units. His critics demanded continuous variation; Mendel's data showed discrete ratios.
Mendel = DISCRETE units, NOT blending. Math + large samples + successive generations = rigour. Contemporaries hated math in biology.
- Rejection reason 1: Discrete non-blending factors contradicted the continuous-variation / blending-inheritance view.
- Rejection reason 2: Use of mathematics in biology was totally new and unacceptable to contemporaries.
- Rejection reason 3: Mendel had no physical proof of what 'factors' were made of (DNA not yet known).
- Rigour came from: large sample sizes + confirmation across successive generations + statistical analysis.
Consider the following statements about the scientific rigour of Mendel's methodology: S1: Mendel used a large sample size, which reduced the impact of chance deviations on his progeny ratios. S2: Mendel confirmed his inferences across successive generations of test crosses. S3: Mendel was among the first to apply mathematical/statistical analysis to interpret biological problems. S4: Mendel studied traits with continuous variation to observe gradual blending of characters. S5: Mendel treated genes (factors) as discrete units that do not blend with each other.
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Correct answer: B — S1, S2, S3 and S5
S1 CORRECT: Large sample size gave statistical credibility (NCERT). S2 CORRECT: Successive generations confirmed the inferences as general rules. S3 CORRECT: Mendel was FIRST to apply mathematics to biology — unaccepted by contemporaries. S4 WRONG: Mendel studied DISCRETE (discontinuous) traits (round/wrinkled, tall/short) — NOT continuous variation. His critics demanded continuous variation; Mendel's data showed discrete ratios. S5 CORRECT: Factors/genes treated as discrete non-blending units — the foundational principle of Mendelian inheritance.
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