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. Mutations which are not dominant are not lost by a gene pooL This is known as
  2. The chromosomal theroy of heredity implies that
  3. Reverse transcription was discovered by
  4. Exhibition of superiority by a hybrid over both of its parents is called
  5. Linkage is
  6. The best method to determine whether an individual is homozygous or heterozygous is
  7. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  8. Albinism in com plants is best described as
  9. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  10. Base substitutions from base analogues I are called
  11. Crossing over in meiosis occurs in
  12.  A chemical mutagen is
  13. Down's syndrome is an example of
  14. The first person to induce mutations was
  15. Klinefelter's syndrome is developed when the chromosome in male is
  16. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  17. When two genes are situated very close to each other in a chromosome
  18. The segment of DNA which participates in crossing over is known as
  19. The term 'meiosis' was coined bv
  20. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  21. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  22. In a monohybrid cross the Fi ratio of a backcross is
  23. Lethal genes are those which
  24. DNA duplication occurs in
  25. Dyad is
  26. Colour blindness is caused due to
  27. The genetic constitution of an organism is known as
  28. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  29. When is the sex of an offspring decided
  30. A child is bom with an extra chromosome in each of its cells. This is usually the result of