Gen Biology Lab Assignment Home Page

Name______________________________________

GENETICS PROBLEMS

General Biology Lab

 

1.  Smooth seeds are dominant over wrinkled seeds.

A cross is made between a wrinkled seed variety and a heterozygous smooth seed variety.

What is the genotype of the parents _______________ ____________

What type of gametes can the parents produce_______ _________

Fill in the Punnett Square:

 

 

 

  

 

 

  

Genotype and Phenotype of the Offspring Probability of the Phenotype Occurring

 

____________________ ________

 

____________________ ________

 

2.  In certain plants a red flower is dominant over a white flower.

2 varieties that were heterozygous for this trait were crossed.

What is the genotype of the parents _______________ ____________

What type of gametes can the parents produce_______ _________

Fill in the Punnett Square:

 

 

  

 

 

  

Genotype and Phenotype of the Offspring Probability of that Phenotype Occurring

 

____________________ ________

 

____________________ ________

 

3.  Parental cross: red-eyed mouse x white-eyed mouse

A).    f1 generation : all red-eyed mice

2nd cross involves 2 red-eyed individuals from the f1 generation

The 2nd generation (f2) offspring are 30 red-eyed mice & 10 white-eyed mice

For the first cross:

What is the genotype of the parents _______________   ____________

What type of gametes can the parents produce_______   _________

Fill in the Punnett Square:

 

 

 

  

 

 

  

Genotype and Phenotype of the Offspring Probability of the Phenotype Occurring

 

____________________         ________

 

B).   For the second cross of the f1 offspring:

What is the genotype of the parents _______________    ____________

What type of gametes can the parents produce_______      _________

Fill in the Punnett Square:

 

 

 

  

 

 

  

Genotype and Phenotype of the Offspring Probability of the Phenotype Occurring

 

____________________ ________

 

____________________ ________

 

 

4.           Parental cross: long-eared mouse x short-eared mouse

Results in a f1 of: 10 long-eared mice and 10 short-eared mice

What is the genotype of the parents _______________ ____________

What type of gametes can the parents produce_______ _________

Fill in the Punnett Square:

 

 

  

 

 

  

Genotype and Phenotype of the Offspring Probability of the Phenotype Occurring

 

____________________ ________

 

____________________ ______

 

5.   Ebony body color in fruit flies is recessive to the allele for normal tan color.

Parental cross: homozygous ebony fruit fly x heterozygous tan fruit fly.

Find the genotype and phenotype ratios.

What is the genotype of the parents _______________ ____________

What type of gametes can the parents produce_______ _________

Fill in the Punnett Square:

 

 

  

 

 

  

Genotype and Phenotype of the Offspring Probability of the Phenotype Occurring

 

____________________ ________

 

____________________ ________

6.  Individuals that are heterozygous for sickle cell disease are resistant to malaria.

The 4 offspring of 2 people that are resistant to malaria have normal red blood cells, sickle cells or cells that are resistant to malaria.

What is the genotype of the parents _______________ ____________

What type of gametes can the parents produce_______ _________

Fill in the Punnett Square:

 

 

 

 

 

Genotype and Phenotype of the Offspring Probability of the Phenotype Occurring

 

____________________ ________

 

____________________ ________

 

____________________ ________