I have moved this thread to a more appropriate forum where hopefully you'll get more responses
First of all it sounds like you are very interesting in pursuing a biology degree, that I am glad to hear.
The first thing I will address is your choice of degree. A general biology degree is a very good way to decide on where you want to specialise and what sort of career you are looking for. The popular ones are Biological Science, Biology, Bioscience and Biomedical Science. Other popular ones include sub branches of biology, and Biochemistry is a very strong degree to have. I suggest you look into the sort of topics which come up in these courses, look at universities on their websites about course depth/structure/intensity/requirements and compile a list of ones that interest you.
Secondly, Forensic Science is a good degree but it comes with some difficulties. It is very difficult to get a job in forensics in today's society. You will need to have impeccable grades from a Russel group university to even be considered to a job (from what I've heard). If you still want to pursue this career choice, make sure you work hard and you are dedicated to doing well.
Lastly, you shouldn't worry about master's courses at this stage. You will need to do a bachelor's degree first regardless of what master's course you want to do. If you want to study Forensics, I strongly recommend a Forensic science BSc or similar. BSc courses are 3 year undergraduate courses. while a master's is typically a 1 year postgraduate course. The application process for a master's course is a lot less competitive than the undergraduate admissions process. You can pretty much apply to any master's course (be it arts, english, law, engineering ect...) if you do well in a science degree. They are a lot more flexible, since you will have to pay for the master's yourself.
Back to your example, yes you can get a MSc in Forensics with a Bioscience degree, but you will more likely get a job in forensics if you studied a Forensics degree for 3 years, and even more so if you studied a MSc after (so for 4 years). In my opinion, it's still early stages and you should still consider all the other alternative career paths from any biology degree.