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Which disease results from the genetic inability to synthesize a single enzyme ?

A. Diabetes

B. Phenylketonuria

C. Colour-blindness

D. Down's syndrome

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  1. Diakinesis is characterised by
  2. The first person to induce mutations was
  3. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  4. Klinefelter's syndrome is developed when the chromosome in male is
  5. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  6. Which one of the following chemical characteristics is not common to all living beings ?
  7. How many meiosis will be required to produce 102 pollen-grains ?
  8. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  9. The scientists who rediscovered the Mendel's laws are
  10. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  11. The condition in which only one allele of a pair is present is known as
  12. Lethal genes are those which
  13. Reverse transcription was discovered by
  14. The number of characters investigated by Mendel was
  15. Which disease results from the genetic inability to synthesize a single enzyme ?
  16. Exhibition of superiority by a hybrid over both of its parents is called
  17. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  18. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  19. In humans, an example of sex-linked trait is
  20. When two genes are situated very close to each other in a chromosome
  21. In a monohybrid cross the Fi ratio of a backcross is
  22. Mutations which are not dominant are not lost by a gene pooL This is known as
  23. Crossing over in meiosis occurs in
  24. Transfer of a gene or genes through a virus is called
  25. Among the following which is a test cross?
  26. Dyad is
  27. The nuclear membrane completely disappears during
  28. The term 'meiosis' was coined bv
  29.  A chemical mutagen is
  30. In the Operon concept, the regulator gene regulates chemical reactions in the cell by