Patterns of Inheritance Practice
You are a geneticists applying for a employment by a prestigious university.
The first task you have been given is to determine the inheritance pattern of a plant that produces
beautiful flowers. These flowers can be red, yellow or orange. You have been given the following data to
work with:
A purebred plant with red flowers was crossed with a purebred plant with yellow flowers. The F1 were
plants orange flowers. When allowed to self-pollinate, the plants with orange flowers produced 182
plants with orange flowers, 61 plants with yellow flowers, and 77 plants with red flowers.
Analyze the data. Identify an inheritance pattern. Determine if the data support your hypothesis by
conducting a chi-square statistical analysis test.
Predicted Inheritance Pattern______________________________________________________________
Null Hypothesis________________________________
Show your work:
X2____________________________________
df____________________________________
cv_____________________________________
Conclusion (Accept/Reject & why)_____________________________________________________________________________
A human female "carrier" who is heterozygous for the recessive, sex-linked trait
causing hemophilia marries a normal male. What proportion of their male progeny
will be hemophiliac?
Show your work by completing the following:
Define the alleles:
State the Parent Genotypes:
Complete the Punnett Square:
Answer the Question:_______________________________________________
The pedigree to the right shows a family’s pedigree
for Hitchhiker’s Thumb. Is this trait
dominant or recessive? _______________________
How do you know? _________________________
___________________________________________
I
1
2
1
2
II
How are individuals III-1
and III-2 related? ________________________
How would you name the 2 individuals that
have hitchhiker’s thumb? ___________________
3
4
III
1
2
3
IV
Name the 2 individuals that were
carriers of hitchhiker’s thumb. ______________
1
2
3
Is it possible for individual IV-2 to be a carrier? ___________ Why? ________________________________________
4