Origins of Danes and modern Denmark DNA
If we look Scandinavia have in average 25% of R1a haplogroup and Norway about 30%. Denmark about 15% R1a, and Swedes are not examined fully yet...
The indigenous genetic haplogroup of the Danes, Swedes and Scandinavians all together is I2.
R1a is a Northern-Slavic haplogroup, it has some influence in Scandinavia but it is not their indigenous haplogroup.