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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

Correct Answer : B.


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  1. In humans, an example of sex-linked trait is
  2. Linkage is
  3. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  4. In a monohybrid cross the Fi ratio of a backcross is
  5. The chromosomal theroy of heredity implies that
  6. Dyad is
  7. Reverse transcription was discovered by
  8. A codon is a sequence of 3 nucleolides on
  9. The term 'meiosis' was coined bv
  10. Exhibition of superiority by a hybrid over both of its parents is called
  11. The scientists who rediscovered the Mendel's laws are
  12.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  13. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  14. Down's syndrome is an example of
  15. Albinism in com plants is best described as
  16. The best method to determine whether an individual is homozygous or heterozygous is
  17. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  18.  A chemical mutagen is
  19. The genetic constitution of an organism is known as
  20. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  21. Transfer of a gene or genes through a virus is called
  22. The segment of DNA which participates in crossing over is known as
  23. Which one of the following chemical characteristics is not common to all living beings ?
  24. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  25. Lethal genes are those which
  26. Chromosomes exhibit minimum coiling during
  27. Base substitutions from base analogues I are called
  28. Crossing over in meiosis occurs in
  29. The first person to induce mutations was
  30. An offspring of two homozygous parents different from one another by alleles at only one gene locus…