science
Grade-10
Easy

Question

Which is not a pair of contrasting traits studied by Mendel?

  1. Green and yellow pods

  2. Full and constricted pods

  3. Axial and terminal flowers

  4. Pink and white flowers

hintHint:

Based on the reproductive part of a plant.

The correct answer is:

Pink and white flowers


    • Gregor Mendel, father of Genetics, developed the law of inheritance
    • An experiment was conducted on garden peas 
    • 7 different phenotypes or traits were considered
    • A cross was made between two plants: one dominant and one recessive
    • The traits exhibited by the dominant and recessive plants are as follows:
      Character Dominant Recessive
      Seed shape Smooth Wrinkled
      Seed color Yellow Green
      Flower color Purple White
      Pod shape Inflated Constricted
      Pod color Green Yellow
      Flower position Axial Terminal
      Stem length Tall Dwarf

    • Gene is the hereditary unit
    • Gene can have different versions called alleles
    • The alleles can be dominant or recessive
    • The presence of a dominant allele will mask the presence of a recessive allele

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    Mendel’s idea that the pair of alleles of each parent separate and only one allele from each parent is passed to an offspring is explained by:

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    1. Gene can exist in various versions called alleles
    2. During meiosis, separation of allelic pair occurs providing single allele to each gamete
    3. Organisms inherit two alleles for each phenotype
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    1. Gene can exist in various versions called alleles
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      CharacterDominantRecessive
      Seed shapeSmoothWrinkled
      Seed colorYellowGreen
      Flower colorPurpleWhite
      Pod shapeInflatedConstricted
      Pod colorGreenYellow
      Flower positionAxialTerminal
      Stem lengthTallDwarf

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      CharacterDominantRecessive
      Seed shapeSmoothWrinkled
      Seed colorYellowGreen
      Flower colorPurpleWhite
      Pod shapeInflatedConstricted
      Pod colorGreenYellow
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      Stem lengthTallDwarf

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