Pedigree tutorial

Pedigree quiz

Multiple Choice:

  1. In this pedigree, the shaded individuals are homozygous recessive. What is the genotype of individual B?
    1. A. hemizygous (no way!)
    2. B. heterozygous (AWESOME!)
    3. C. homozygous recessive (no how!)
    4. D. homozygous dominant (no clue!)
    5. E. can not tell from the diagram (no mas!)

  2. What is the genotype of individual E?
    1. A. heterozygous (FOR SURE!)
    2. B. homozygous recessive (nah nah nah nah!)
    3. C. homozygous dominant (fe-fi-fo-fum!)
    4. D. none of the above (good grief!)
    5. E. can not tell from the diagram (not by the hair on my chinny chin chin!)

  3. If E married an individual who is homozygous recessive, what is the probability that their first child will be homozygous recessive?
    1. A. 1/8 (fugetaboutit!)
    2. B. 1/4 (dude?!)
    3. C. 1/2 (NO DOUBT!)
    4. D. 1 (you, not genius!)
    5. E. 0 (bah humbug!)