Correct option is A
Sutton, who was American, studied chromosomes and meiosis in grasshoppers. Boveri, who was German, studied the same things in sea urchins. In 1902 and 1903, Sutton and Boveri published independent papers proposing what we now call the chromosome theory of inheritance. Alfred Sturtevant was student of Morgan who used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and ‘mapped’ their position on the chromosome. Today genetic maps are extensively used as a starting point in the sequencing of whole genomes. Henking could trace a specific nuclear structure all through spermatogenesis in a few insects, and it was also observed by him that 50% of the sperm received this structure after spermatogenesis, whereas the other 50% sperm did not receive it. Henking gave a name to this structure as the X body. Frederick Griffith gave the transforming principle.
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