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Q: In which year did an American cytogeneticist named Joe Hin Tjio published research that defined 2n = 46 as the exact number of human chromosomes?
  • A. 1956
  • B. 1950
  • C. 1952
  • D. 1960
Correct Answer: Option A - Joe Hin Tjio was an Indonesian-born American cytogeneticist who made a groundbreaking discovery in the field of genetics. He is known for being the first to correctly identify the number of human chromosomes as 46, which was a significant advancement in the field of genetics . The research was published in the year 1956.
A. Joe Hin Tjio was an Indonesian-born American cytogeneticist who made a groundbreaking discovery in the field of genetics. He is known for being the first to correctly identify the number of human chromosomes as 46, which was a significant advancement in the field of genetics . The research was published in the year 1956.

Explanations:

Joe Hin Tjio was an Indonesian-born American cytogeneticist who made a groundbreaking discovery in the field of genetics. He is known for being the first to correctly identify the number of human chromosomes as 46, which was a significant advancement in the field of genetics . The research was published in the year 1956.