Chromosomal Theory of Inheritance — NEET Biology
📚 Practice ConceptWho had proposed the chromosomal theory of the inheritance?
Which of the following statements correctly trace the historical advancements in the understanding of inheritance? S1. Gregor Mendel conducted his hybridisation experiments on garden peas from 1856 to 1863. S2. Mendel's work remained unrecognised until 1900, when it was independently rediscovered by de Vries, Correns, and von Tschermak. S3. The movement of chromosomes during meiosis was worked out by Walter Sutton and Theodore Boveri in 1902. S4. Thomas Hunt Morgan’s experimental verification of the chromosomal theory of inheritance used Drosophila melanogaster. S5. The concept of linkage and recombination was introduced by Alfred Sturtevant based on his studies with Drosophila.
View solution & NCERT explanation
Correct answer: B — S1, S2, S3 and S4 only
The core concept is the historical timeline of genetic discoveries as presented in the chapter. S1. NCERT states: 'Gregor Mendel, conducted hybridisation experiments on garden peas for seven years (1856-1863)'. So, S1 is correct. S2. NCERT states: 'Mendel published his work on inheritance of characters in 1865 but for several reasons, it remained unrecognised till 1900. In 1900, three Scientists (de Vries, Correns and von Tschermak) independently rediscovered Mendel’s results'. So, S2 is correct. S3. NCERT states: 'By 1902, the chromosome movement during meiosis had been worked out. Walter Sutton and Theodore Boveri noted that the behaviour of chromosomes was parallel to the behaviour of genes'. So, S3 is correct. S4. NCERT states: 'experimental verification of the chromosomal theory of inheritance by Thomas Hunt Morgan and his colleagues... Morgan worked with the tiny fruit flies, Drosophila melanogaster'. So, S4 is correct. S5. Morgan and his group introduced the concept of linkage and recombination. His student, Alfred Sturtevant, used the frequency of recombination to map gene positions, but the initial concept was Morgan's. So, S5 is NOT correct as stated that Sturtevant introduced the concept. Morgan coined the terms. Sturtevant used the frequency. Therefore, statements S1, S2, S3, and S4 are correct. The tested concept is the chronological understanding of major contributions to genetics.
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