In 1956, Indonesia-born American cytogeneticist Joe Hin Tjio announced that the exact number of human chromosomes is _____.
40
The correct answer is 46.
Key Points
- Joe Hin Tjio:-
- He was an Indonesian-born American cytogeneticist who made significant contributions to the field of genetics, particularly in understanding the structure and number of human chromosomes.
- Joe Hin Tjio announced that the exact number of human chromosomes is 46.
Additional Information
- Human Chromosomes:-
- Humans have 23 pairs of chromosomes in each cell, for a total of 46 chromosomes.
- These chromosomes are organized into two main types:-
- Autosomes: The first 22 pairs of chromosomes are called autosomes. They are not involved in sex determination.
- Sex chromosomes: The 23rd pair of chromosomes is called the sex chromosomes. These chromosomes determine an individual's sex. Females typically have two X chromosomes (XX), while males typically have one X chromosome and one Y chromosome (XY).
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