Genetics Practice Test

1.  In goldfish, the allele for orange scales is dominant over the allele for white scales.  Cross a heterozygous orange scaled goldfish with a white scaled goldfish.  What is the genotype ratio of the offspring?

 

 

 

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2.  Cross a heterozygous orange goldfish with a homozygous orange goldfish.  What is the phenotype ratio of the offspring?

 

 

 

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3.  In pea plants the allele for tall is dominant over the allele for short.  The allele for yellow seeds is dominant over the allele for green seeds.  Cross a heterozygous tall, heterozygous yellow seeded plant with a short, green seeded plant.  What is the genotype ratio of the offspring?

 

 

 

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4.  Cross a homozygous tall, green seeded plant with a short, heterozygous yellow seeded plant.  What is the phenotype ratio of the offspring?

 

 

 

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5.  In chimps, long hair is dominant over short hair.  A long haired chimp mates with a short haired chimp and over the years produces 4 long haired offspring and 2 short haired offspring.  What is the genotype of the long haired parent?

 

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6.  A man with type B blood with a father with type A blood marries  a woman with type O blood.  What would be the phenotype ratio of the offspring?

 

 

 

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7.  A normal woman whose father was a hemophiliac marries a normal man.  What would be the possible genotypes of the offspring?

 

 

 

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8.  A tall, yellow seeded plant is crossed with a short, green seeded plant.  The numbers of the different types of offspring are listed below.

 

tall yellow                              tall green                                short yellow                                          short green

      24                                             16                                            32                                                             33

 

What is the genotype of the tall, yellow seeded parent?                                              _____________________