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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. In a monohybrid cross the Fi ratio of a backcross is
  2. A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
  3. The science dealing with study of inheritance and variation is
  4. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  5. Linkage is
  6. The scientists who rediscovered the Mendel's laws are
  7.  A chemical mutagen is
  8. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  9. The segment of DNA which participates in crossing over is known as
  10. Klinefelter's syndrome is developed when the chromosome in male is
  11. The chromosomal theroy of heredity implies that
  12. Exhibition of superiority by a hybrid over both of its parents is called
  13. Base substitutions from base analogues I are called
  14. The condition in which only one allele of a pair is present is known as
  15. The best method to determine whether an individual is homozygous or heterozygous is
  16. Reverse transcription was discovered by
  17. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  18. Some people experience PTC paper on tongue as bitter, others as tasteless. This character is hereditary…
  19. A codon is a sequence of 3 nucleolides on
  20. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  21. How many meiosis will be required to produce 102 pollen-grains ?
  22. When is the sex of an offspring decided
  23. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  24. The number of characters investigated by Mendel was
  25. Chromosomes exhibit minimum coiling during
  26. Linked genes may be separated by the process of
  27. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  28. Which one of the following chemical characteristics is not common to all living beings ?
  29. The nuclear membrane completely disappears during
  30. In humans, an example of sex-linked trait is