Tjio and Levan's contribution is very significant because they __________ ?
Correct answer: D. Gave the number of human chromosomes
- A. Identified barr bodies
- B. Detected sex linkage
- C. Pointed out mutational changes
- D. Gave the number of human chromosomes
Explanation
Tjio and Levan established in 1956 that the normal human diploid chromosome number is 46, correcting the earlier accepted count of 48. Barr bodies, sex linkage, and mutation studies were associated with other discoveries. Students may choose identification of Barr bodies because both topics concern chromosomes, but Barr bodies were described by Murray Barr and Ewart Bertram.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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