Which of the following mutations are most likely to affect the phenotype of the individual? Check all that apply. Select all that apply: a. C to T transition at an intron-exon C boundary b. Substitution in the 3rd codon position C. C to T transition in the first codon position d. Robertsonian translocation 13:21 . e. A to C transversion in the 3rd codon position. f. Indel in the reading frame of a gene