Paper Assignment

Punnett Square Practice

For questions 1-6, use the Punnett Square to determine the types of offspring which can be produced in the following scenarios.  Then list the genotype of each parent, the phenotype of each parent, the possible genotypes of the offspring and the possible phenotypes of the offspring.

  1. A green pea plant (Gg) is crossed with a yellow pea plant (gg).
  
  

genotype of parents:

phenotype of parents:        

genotype of offspring:

phenotype of offspring:

  • A tall plant (TT) is crossed with a tall plant (Tt).
  
  

genotype of parents:

phenotype of parents:        

genotype of offspring:

phenotype of offspring:

  • A tall plant (Tt) is crossed with a short plant (tt).
  
  

genotype of parents:

phenotype of parents:        

genotype of offspring:

phenotype of offspring:

  
  
  • A red flower (Rr) is crossed with a white flower (rr).

genotype of parents:

phenotype of parents:        

genotype of offspring:

phenotype of offspring:

  
  
  • A white flower (rr) is crossed with a white flower (rr).

genotype of parents:

phenotype of parents:        

genotype of offspring:

phenotype of offspring:

  
  
  • A black chicken (BB) is crossed with a black chicken (BB).

genotype of parents:

phenotype of parents:        

genotype of offspring:

phenotype of offspring:

Complete the following problems.  List the parent genotypes, draw and fill in a Punnett square, and then list the offspring genotypes and phenotypes.

  1. A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 
  1. Two heterozygous white (brown fur is recessive) rabbits are crossed.
  1. Two heterozygous red flowers (white flowers are recessive) are crossed.

4.    A homozygous tall plant is crossed with a heterozygous tall plant (short is the recessive size).

  1. A heterozygous black rabbit is crossed with a homozygous white rabbit.

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