Simple Genetics Practice Problems



Simple Genetics Practice Problems

1. For each genotype, indicate whether it is heterozygous (HE), homozygous dominant (HD) or homozygous recessive (HR)

|AA ____ |Ee ____ |Ii ____ |Mm ____ |

|Bb ____ |ff ____ |Jj ____ |nn ____ |

|Cc ____ |GG ____ |kk ____ |OO ____ |

|Dd ____ |HH ____ |Ll ____ |Pp |

2. For each of the genotypes below, determine the phenotype.

|Purple flowers are dominant to white flowers |Brown eyes are dominant to blue eyes |

|PP ___________________________ |BB ___________________________ |

|Pp ___________________________ |Bb ___________________________ |

|pp ___________________________ |bb ___________________________ |

|Round seeds are dominant to wrinkled |Bobtails are recessive (long tails dominant) |

|RR ___________________________ |TT ___________________________ |

|Rr ___________________________ |Tt ___________________________ |

|rr ___________________________ |tt ___________________________ |

3. For each phenotype, list the genotypes. (Remember to use the letter of the dominant trait)

|Straight hair is dominant to curly. |Pointed heads are dominant to round heads. |

|____________ straight |____________ pointed |

|____________ straight |____________ pointed |

|____________ curly |____________ round |

4. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive). In the table, provide the genotypes and phenotypes of the possible offspring from these two heterozygous parents.

|Genotype |Phenotype |

|1. | |

|2. | |

|3. | |

|4. | |

R r

R

r

5. In guinea pigs, the allele for short hair is dominant to the allele for long hair. Show a cross between a homozygous dominant parent and a heterozygous parent.

|Genotype |Phenotype |

|1. | |

|2. | |

|3. | |

|4. | |

S s

S

S

6. In humans, the allele for brown eyes is dominant to the allele for blue eyes. Show a cross between a homozygous dominant parent and homozygous recessive parent.

|Genotype |Phenotype |

|1. | |

|2. | |

|3. | |

|4. | |

7. Straight hair is dominant to curly hair. Show the cross between 2 heterozygous parents. What percentage of the offspring will have curly hair? What percentage of the offspring will be heterozygous?

-----------------------

rr

Rr

Rr

RR

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