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The condition in which only one allele of a pair is present is known as

A. Homozygous

B. Heterozygous

C. Hemizygous

D. Incomplete dominance

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  1. The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
  2.  A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
  3. Albinism in com plants is best described as
  4. When two genes are situated very close to each other in a chromosome
  5. The first person to induce mutations was
  6. The chromosomal theroy of heredity implies that
  7. A giant chromosome having many chromo-nemata lying side by side all along their length is called
  8. The number of characters investigated by Mendel was
  9. Among the following which is a test cross?
  10. Crossing over in meiosis occurs in
  11. An offspring of two homozygous parents different from one another by alleles at only one gene locus…
  12. Which one of the following chemical characteristics is not common to all living beings ?
  13. Diakinesis is characterised by
  14. A functional unit of a gene which specifies synthesis of one poly-peptide is known as
  15. Lethal genes are those which
  16. Linked genes may be separated by the process of
  17. A colour-blind man marries the daughter of a colour-blind person. In their progeny
  18. Transfer of a gene or genes through a virus is called
  19. Linkage is
  20. Colour blindness is caused due to
  21. Reverse transcription was discovered by
  22. The genetic constitution of an organism is known as
  23. Klinefelter's syndrome is developed when the chromosome in male is
  24. The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
  25. A child is bom with an extra chromosome in each of its cells. This is usually the result of
  26. Base substitutions from base analogues I are called
  27. The segment of DNA which participates in crossing over is known as
  28. Down's syndrome is an example of
  29. If an individual does not breed true for its characters, it is called
  30. DNA duplication occurs in