A) Landsteiner
B) Moorehead
C) Tijo and Levan
D) J.L. Hamerton.
Correct Answer: C
Solution :
: Tijo and Levan in the year 1956 determined the human chromosome number correctly. In human beings there are 23 pairs of chromosomes of which 22 pairs are autosomes and 1 pair is of sex chromosomes. The autosomes are homologous while the sex chromosomes are same in females (XX) but different in males (XY). Sex chromosomes are also called heterosomes or allosomes.
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