Question Do all haplogroups descended from haplogroup CF have these mutations?

[ElijahShell]

I am new to genealogy, is it true that all descendants of haplogroup CF-P143(haplogroup C, F, G, H, IJ, K...) inherited these 4 mutations below and are still carrying them today:

while haplogroup B, and DE doesn't have them, that's why only the descendants of C and F can trace their ancestry back to CF-P143.
Similarly, they put haplogroup CF and DE under the same tree which is haplogroup CT, because both haplogroup CF and DE descendants shared all these mutations below:

but haplogroup B doesn't have those mutations, hence B is not under the CT haplogroup tree. Am I understanding it correct?

 

[Gao1111]

Correct

 

[ElijahShell]

Correct

How do we know that it is BT that gave birth to CT, but not the other way around? What evidence suggests that CT descended from BT, but BT didn't descend from CT?

 

[Gao1111]

How do we know that it is BT that gave birth to CT, but not the other way around? What evidence suggests that CT descended from BT, but BT didn't descend from CT?

because they are linked