How does the trna molecule differ froom mrna in shape and HOW are mutations passed on to offspring?

well it's shaped like a cow.

shape and purpose

trna is clover shaped and involved in bringing the amino acids to the 80S ribosome complex

mrna = messenger rna the copy of rna that a ribosome translates into a protein. (linear strand with 5' cap and poly A tail)

Well I'm not an expert on the subject but, I do know that mRNA is composed of A (adenine) G (guanine) C (cytosine) and T (Thymine) however Thymine is replaced by Uracil in tRNA. If you think about how RNA gathers its information from DNA it would make sense how mutations could occur. For instance, RNA will copy a single strand from the DNA... (which could look something like this)   TAC UAG GCT TAG etc.... and then make the other strand by creating the reverse nucleotides (C always matches with G, A always matches with T, unless it is tRNA which is in that case Uracil or U). So if tRNA is decoding information like mRNA normally would it would be pretty screwed up. Instead of the required Uracil combinations you would have a bunch of Thymine everywhere. These mutations would be passed GENETICALLY, of course, to offspring....simply because it is the DNA! hope this helps.