Homework Problems:


  1. Homework Problems:
  1. Hemophilia is a sex-linked recessive disease that causes reduced blood clotting, which can result in increased bruising and excessive bleeding. Monica who is a carrier for hemophilia marries Eric (he does not have hemophilia). Use the letter H when writing genotypes.
  1. What is Monica’s genotype?
  • What is Eric’s genotype?

Show all work including a Punnett square below.

  • What are the phenotypes of the sons?
  • What are the phenotypes of the daughters?
  • What is the chance Eric and Monica will have a child with hemophilia?
  • In humans, earlobes are either “free” or “attached”. The free earlobe trait is dominant over attached earlobes. The ability to taste certain substances is also genetically controlled. Some people can taste Phenylthiocarbamate (PTC), a dominant trait, while others cannot (the recessive trait).

A man heterozygous for both free earlobes and ability to taste PTC marries a woman with attached earlobes who is heterozygous for the ability to taste PTC.  Show all work including a Punnett square below. E= free earlobes; e = attached earlobes; P = PTC taster; p = non PTC taster.

  1. What are the genotypes of the parents?

Male’s genotype:                                                             Female’s genotype:

  • What are the possible gametes for each parent? Draw a Punnett square to determine the genotypes and phenotypes of their children.
  • c.               What is the phenotypic ratio for this cross? Be sure to write out phenotypes.
  • Phenylketonuria is an autosomal recessive disorder (see section V) that causes mental impairment and reduced pigmentation of hair and skin. A woman with phenylketonuria and a man heterozygous for phenylketonuria have children.

Female’s genotype:                                 Male’s genotype:

  1. Show all work including a Punnett square.
  • What is the probability of a child with phenylketonuria?
  • Alisha has blood type B. Her mother has blood type O. Alisha marries Jared, who has blood type AB.
  1. What is Alisha’s genotype?
  • What is Jared’s genotype?
  • Using a Punnett square, determine the probability of the couple having a child with the following:

blood type B? blood type O? blood type AB? blood type A?

  • Alisha and Jared divorce. Alisha marries Daniel whose blood type is O. Daniel’s genotype:
  • What is the chance that Alisha and Daniel will have a child with blood type O?
  • Achondroplasia is an autosomal dominant (see section V) condition that results in short stature or dwarfism due to lack of bone growth. Ndidi has achondroplasia and is concerned about passing it on to her children. Her father was of normal height, but her mother had achondroplasia. Use the letter A when writing genotypes.
  1. What are the genotypes of Ndidi’s mother and father?
  • What is Ndidi’s genotype?
  • Ndidi marries Abubakar, who is heterozygous for achondroplasia. What is Abubakar’s genotype?
  • What is the chance that Ndidi and Abubakar’s children will have this condition?

Show all work including a Punnett square below.

  • 6)  Fragile X disorder is a sex linked recessive disorder. Albinism is an autosomal recessive trait characterized by a lack of pigment in the skin, eyes and hair. HINT: THE GENES INVOLVED ARE ON TWO DIFFERENT CHROMOSOMES!

Kyra is a carrier for Fragile X disorder and is unaffected by albinism. Kyra’s mother has unpigmented skin, eyes and hair. Kyra marries Randy who is an albino, and does not have Fragile X disorder.

  1. What is Kyra’s genotype?
  • What is Randy’s genotype?
  • What are the possible genotypes and phenotypes of their children? Use a Punnett square.
  • What is the chance of having a child with Fragile X disorder that is also an albino?
  • What would be the gender of this child?
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