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Amino acid sequences of cytochrome $c$ and ribulose $5$-phosphate epimerase from $40$ organisms were chosen and phylogenetic trees were obtained for each of these two protein families.

Determine the correctness or otherwise of the following Assertion [$a$] and the
Reason [$r$].

Assertion [$a$]: The two trees will not be identical

Reason [$r$]: The nature and frequency of mutations in the two families are different

  1. Both [$a$] and [$r$] are true and [$r$] is the correct reason for [$a$]
  2. Both [$a$] and [$r$] are true but [$r$] is not the correct reason for [$a$]
  3. Both [$a$] and [$r$] are false
  4. [$a$] is false but [$r$] is true.
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