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1. In humans, red-green colorblindness is a sex-linked recessive trait. A normal woman has a colorblind son with a normal man. What is the woman's

  • 1.  In humans, red-green colorblindness is a sex-linked recessive trait.  A normal woman has a colorblind son with a normal man.
  •  What is the woman’s genotype?
  • What is the son’s genotype?
  • What is the father’s genotype?
  • What is the mom’s phenotype?
  • What is the dad’s phenotype?
  • 2. Gregor Mendel used pea plants in his genetics experiments.  If he crossed a homozygous green pea pod with a heterozygous green pea pod:
  •  What is the probability that a yellow pea pod would result?
  • What is the genotype of a homozygous green pea pod?
  • What is the genotype of a heterozygous green pea pod?
  • What is the dominant allele for pea pod color?
  • What is the recessive allele for pea  pod color?
  •  3.Xeroderma pigmentosum is an autosomal recessive disorder.  If a normal woman wants to have children with a man with this disorder:
  •  What is/are the genotype(s) of the woman?
  • What is the genotype of the man?
  • What is the genotype of the child if mom is homozygous?
  • What is the phenotype of the child?
  • Is the xeroderma pigmentosum gene on  the Y chromosome?
  • 4.In cats, short fur is most prevalent over long fur.
  •  Which allele is dominant?
  • Which allele is recessive?
  • What would be the genotype of a homozygous short-fur cat?
  • What would be the genotype of a homozygous long-fur cat?
  • What would be the genotype of a heterozygous dominant cat?

  

 5.  Gametes are sex cells.  According to Gregor Mendel’s laws:

 How many total chromosomes are in a normal human sperm cell?

 How many total chromosomes are in a normal human egg cell?

 How many total chromosomes are in a Down Syndrome autosomal cell?

 How many total chromosomes are in a normal human skin cell?

 What genetic mistake occurred in Down’s Syndrome?

           

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