Monohybrid And Dihybrid Crosses

9 Questions | Total Attempts: 2842

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Monohybrid And Dihybrid Crosses - Quiz

Show me that you understand how to predict the possible outcome of mono and dihybrid crosses using Punnett squares. Use the following letters for your crosses: T = tall t = short G = green seeds g = yellow seeds P = purple flowers p = white flowers


Questions and Answers
  • 1. 
    A purebred pea plant for height is crossed with a hybrid for height. The phenotypic ratio is 4:0.
    • A. 

      True

    • B. 

      False

  • 2. 
    Check all the possible combinations of alelles in this pea plant's pollen:    TtPp
    • A. 

      TP

    • B. 

      Tp

    • C. 

      TT

    • D. 

      Tp

    • E. 

      TP

    • F. 

      PP

  • 3. 
    A homozygous recessive plant has two copies of the ____________________ allele.
  • 4. 
    The ___________________ of the organism is what you can see.
  • 5. 
    The __________________________ of the organism is what is in the genes.
  • 6. 
    Perform the following cross and check the boxes for the correct phenotypic and genotypic ratios.
    • a heterozygous green seeded plant crossed with a purebred recessive for seed color
    • A. 

      Phenotypic ratio 2:2

    • B. 

      Genotypic ratio 2:2

    • C. 

      Phenotypic ratio 1:3

    • D. 

      Genotypic ratio 1:3

    • E. 

      Phenotypic ratio 1:2:1

    • F. 

      Genotypic ratio 1:2:1

  • 7. 
    In the following dihybrid cross there is no need to fill out the whole sixteen square table to determine the outcome.
    • TtGg  x  ttgg
    • A. 

      True

    • B. 

      False

  • 8. 
    When a purebred recessive plant is crossed with a plant with the dominant phenotype you can find out if the second plant is a hybrid or a purebred by looking at the possible offspring. Choose the correct allele combinations of the offspring if the unknown plant's genotype is homozygous dominant.
    • A. 

      All four of the offspring will have the dominant phenotype

    • B. 

      One will have the dominant phenotype and three will have the recessive

    • C. 

      Two will show the dominant phenotype and two the recessive

    • D. 

      One will have the recessive phenotype and three the dominant

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