What is a 2:1 degree and how is it calculated across institutions?

Hi! Im currently applying to MBBS programs in the UK after finishing my undergraduate degree in Life Sciences in Canada. The thing is that I spent 2 years at a US uni and got a GPA of 3.5/4 and then spent 2 years at a Canadian uni (to finish my bachelors) and got a GPA of 2.98/4 (I know, it was rough ok :( ) however the gpa on my Canadian transcript does not account for the marks I earned at the U.S. institution. Hypothetically, for MBBS entry, would they combine my GPA? Also, do I meet the 2:1 requirement for degree holders? I can’t find one single answer for US/Canadian equivalency…

thanks!