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A child is bom with an extra chromosome in each of its cells. This is usually the result of

A. nondisjunction

B. crossing over

C. segregation

D. hybridization

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  1. Lethal genes are those which
  2. Among the following which is a test cross?
  3. The scientists who rediscovered the Mendel's laws are
  4. The genetic constitution of an organism is known as
  5. Base substitutions from base analogues I are called
  6.  A chemical mutagen is
  7. A codon is a sequence of 3 nucleolides on
  8. Crossing over in meiosis occurs in
  9. Which disease results from the genetic inability to synthesize a single enzyme ?
  10. Exhibition of superiority by a hybrid over both of its parents is called
  11. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  12. The best method to determine whether an individual is homozygous or heterozygous is
  13. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  14. DNA duplication occurs in
  15. Transfer of a gene or genes through a virus is called
  16. Which one of the following chemical characteristics is not common to all living beings ?
  17. Down's syndrome is an example of
  18. When is the sex of an offspring decided
  19. The term 'meiosis' was coined bv
  20. The science dealing with study of inheritance and variation is
  21. Linkage is
  22. Colour blindness is caused due to
  23. The segment of DNA which participates in crossing over is known as
  24. The chromosomal theroy of heredity implies that
  25. The condition in which only one allele of a pair is present is known as
  26. Chromosomes exhibit minimum coiling during
  27. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  28. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  29. Albinism in com plants is best described as
  30. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by