Pedigree Practice
Note to Student: When answering the following questions make sure you use your “genetics lingo.”
(i.e. homozygous dominant, homozygous recessive, heterozygous but then also give me the allele
combinations so I’ll know you know what you’re talking about
Pedigree #1
1. Is this condition gender biased, why or why not?
_________________________________________________________
_________________________________________________________
2. Is this condition dominant or recessive, why?
_________________________________________________________
_________________________________________________________
3. For the pedigree do a Punnett Square for the circled relationship. Tell
the percentages for the possible offspring that could result in the
couple.
male alleles
female alleles
5. Write out the alleles for the first, second and third generation offspring
in the circled area.
BONUS:
From the pedigree below, create a third generation using the son who is
shaded. Give him a spouse who is not shaded along with 4 female children
who are all shaded.
Answer the following questions concerning this modified pedigree.
1. Is this condition gender biased, why or why not?
2. Is this condition recessive or dominant, why?
3. Fill in the Punnett square for the son, his spouse and their children
male alleles
female alleles
4. Explain the percentages from the above Punnett Square.
Pedigree #2
1. Is this condition gender biased, why or why not?
_________________________________________________________
_________________________________________________________
2. Is this condition dominant or recessive, why?
_________________________________________________________
_________________________________________________________
3. Write out the alleles for the first, second and third generation offspring
in the circled area.
male alleles
female alleles
4.
For the pedigree do a Punnett Square for the circled relationship. Tell
the percentages for the possible offspring that could result in the
couple.