Who discovered that plant chromosomes undergo meiosis and crossing over, establishing physical genetic maps? MCQ with Answer and Explanation

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Who discovered that plant chromosomes undergo meiosis and crossing over, establishing physical genetic maps?

A. Gregor Mendel

B. Hugo de Vries

C. Charles Darwin

D. Thomas Hunt Morgan

Answer: Option D

Solution (By JKSSB Mock Tests)

Thomas Hunt Morgan demonstrated chromosome mapping and sex-linked inheritance using Drosophila melanogaster (fruit flies).

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the common mechanical elevator safety brake system was publicly demonstrated at the World's Fair by whom?

A. James Watt

B. Thomas Edison

C. Elisha Otis

D. Henry Bessemer

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Correct Answer: Option C

Explanation:
Otis dramatic demonstration in 1854 involved cutting the platform support rope while standing on it, proving the safety gear worked.

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Question #2

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Who discovered that the velocity of galaxies moving away from Earth is proportional to their distance, establishing Hubble's Law?

A. Isaac Newton

B. Albert Einstein

C. Edwin Hubble and Georges Lemaître

D. Johannes Kepler

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Correct Answer: Option C

Explanation:
Lemaître mathematically derived and Hubble observationally proved the cosmic expansion velocity relation.

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Question #3

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Who invented the alkaline storage battery and the phonograph?

A. Nikola Tesla

B. Thomas Edison

C. Michael Faraday

D. Alessandro Volta

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Correct Answer: Option B

Explanation:
Thomas Alva Edison developed the phonograph in 1877 and later engineered the commercial alkaline storage battery.

This question belongs to: Static General Knowledge Inventions and Discoveries

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