Class XII

Removal of introns and joining the exons in a defined order in a transcription unit is called
  1. Splicing
  2. tailing
  3. transformation
  4. capping
Amino acid sequence in protein synthesis is decided by the sequence of
  1. tRNA
  2. mRNA
  3. cDNA
  4. rRNA
Mutation generally produces
  1. lethal genes
  2. recessive genes
  3. polygenes
  4. dominant genes
Klinefelter’s syndrome is indicated by an XXY sex chromosome combination. This abnormality is due to:
  1. gene deletion.
  2. gene duplication.
  3. gene translocation.
  4. non-disjunction
Pleiotropic gene is
  1. thalesmia
  2. colour blindness
  3. haemophilia
  4. sickle cellanemia
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