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Monohybrid and Dihybrid cross | Extra Documents, Videos & Tests for Class 10 PDF Download

# Monohybrid cross

  • When only one character is considered while crossing two organisms, then such a cross is known as monohybrid cross.
  • The ratio of characters, arising out of this cross, at F2 generation is called monohybrid ratio.
  • E.g., If tall plant (TT) is crossed with a dwarf plant (tt), we get 3 tall:1 short plant at the end of the F2 generation.
  • So, 3:1 is monohybrid ratio.
  • Here, the height of the plant is considered at a time.

# Dihybrid cross

  • When two characters are considered while crossing two organisms, then such a cross is known as a dihybrid cross.
  • The ratio of characters, arising out of this cross, at F2 generation is called dihybrid ratio.
  • E.g., If a plant with round and green pea is crossed with a plant with wrinkled and yellow pea,
  • The first generation plants would all have round and green pea.
  • On crossing the same for an F2 generation, we would observe four combinations of characters in the ratio of 9:3:3:1.
  • Thus, 9:3:3:1 is the dihybrid ratio.
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