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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. Dyad is
  2. Base substitutions from base analogues I are called
  3. If an individual does not breed true for its characters, it is called
  4. Among the following which is a test cross?
  5. The first person to induce mutations was
  6. The condition in which only one allele of a pair is present is known as
  7. DNA duplication occurs in
  8.  A chemical mutagen is
  9. Albinism in com plants is best described as
  10. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  11. The genetic constitution of an organism is known as
  12. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  13.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  14. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  15. Which disease results from the genetic inability to synthesize a single enzyme ?
  16. Diakinesis is characterised by
  17. Mutations which are not dominant are not lost by a gene pooL This is known as
  18. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  19. The nuclear membrane completely disappears during
  20. Linked genes may be separated by the process of
  21. Transfer of a gene or genes through a virus is called
  22. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  23. Chromosomes exhibit minimum coiling during
  24. Klinefelter's syndrome is developed when the chromosome in male is
  25. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  26. Lethal genes are those which
  27. In humans, an example of sex-linked trait is
  28. Colour blindness is caused due to
  29. The scientists who rediscovered the Mendel's laws are
  30. When two genes are situated very close to each other in a chromosome