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Colour blindness is caused due to

A. deficiency of vitamic C

B. sex-linked abnormality

C. absence of rods in retina

D. absence of visual purple in retina

You can do it
  1. The term 'meiosis' was coined bv
  2. In humans, an example of sex-linked trait is
  3. Among the following which is a test cross?
  4. Which one of the following chemical characteristics is not common to all living beings ?
  5. In a monohybrid cross the Fi ratio of a backcross is
  6. The science dealing with study of inheritance and variation is
  7. The scientists who rediscovered the Mendel's laws are
  8. Klinefelter's syndrome is developed when the chromosome in male is
  9. The best method to determine whether an individual is homozygous or heterozygous is
  10. Linkage is
  11. If an individual does not breed true for its characters, it is called
  12. Which disease results from the genetic inability to synthesize a single enzyme ?
  13. Down's syndrome is an example of
  14. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  15. DNA duplication occurs in
  16. When is the sex of an offspring decided
  17. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  18. When two genes are situated very close to each other in a chromosome
  19. Mutations which are not dominant are not lost by a gene pooL This is known as
  20. Lethal genes are those which
  21. Colour blindness is caused due to
  22. Transfer of a gene or genes through a virus is called
  23. Linked genes may be separated by the process of
  24. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  25. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  26. The segment of DNA which participates in crossing over is known as
  27. A codon is a sequence of 3 nucleolides on
  28. Reverse transcription was discovered by
  29.  A chemical mutagen is
  30. Chromosomes exhibit minimum coiling during