In humans, an example of sex-linked trait is

A. Curly hair

B. Sickle-cell anaemia

C. Colour-blindness

D. Down's syndrome

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  1. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  2. Base substitutions from base analogues I are called
  3. The condition in which only one allele of a pair is present is known as
  4. Mutations which are not dominant are not lost by a gene pooL This is known as
  5. Transfer of a gene or genes through a virus is called
  6. A codon is a sequence of 3 nucleolides on
  7. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  8. The first person to induce mutations was
  9. The nuclear membrane completely disappears during
  10. The term 'meiosis' was coined bv
  11. The science dealing with study of inheritance and variation is
  12. The genetic constitution of an organism is known as
  13. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  14. In the Operon concept, the regulator gene regulates chemical reactions in the cell by
  15. Lethal genes are those which
  16. The number of characters investigated by Mendel was
  17. DNA duplication occurs in
  18. In humans, an example of sex-linked trait is
  19. Linkage is
  20. Crossing over in meiosis occurs in
  21. In a monohybrid cross the Fi ratio of a backcross is
  22. Klinefelter's syndrome is developed when the chromosome in male is
  23. Which one of the following chemical characteristics is not common to all living beings ?
  24. The scientists who rediscovered the Mendel's laws are
  25. Which disease results from the genetic inability to synthesize a single enzyme ?
  26. Exhibition of superiority by a hybrid over both of its parents is called
  27. When two genes are situated very close to each other in a chromosome
  28. Among the following which is a test cross?
  29. Chromosomes exhibit minimum coiling during
  30. The chromosomal theroy of heredity implies that