Class XII

By convention, a genotype of RR would indicate
  1. homozygous dominant on any chromosome.
  2. homozygous recessive on autosomes.
  3. heterozygous on male sex chromosomes.
  4. heterozygous on autosomes.
The recessive genes located on X chromosome in humans are always
  1. lethal
  2. sublethal
  3. expressed in males
  4. expressed in females
Molecular basis of organ differentiation relies on modulation in transcription by
  1. RBA polymerase
  2. ribosome
  3. anticodon
  4. transcription factor
If a recombinant DNA carrying antibiotic resistance gene (e.g., tetracycline) is transferred into an E.coli cell, then the host cell is transformed into tetracycline resistant cell. The tetracycline resistant gene in this case is called a
  1. vector
  2. selectable marker
  3. cloning site
  4. recombinant protein.
Pleiotropic gene is
  1. thalesmia
  2. colour blindness
  3. haemophilia
  4. sickle cellanemia
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