All Inheritance Patterns (Genetics Review Ws)
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1
2Name: _______________________________________________ Date: ______________________ Period: ________
Sex‐Linked Inheritance
h
H
6) The gene for normal blood clotting (X
) is dominant to the gene for Hemophilia (X
), which is a sex‐linked recessive
Biology: All Inheritance Patterns (Genetics Review WS)
disorder found on the X‐chromosome of males and females. Marge is a healthy carrier of hemophilia and Homer is
completely healthy. What would be Bart, Liza, and Maggie’s genotypes? Complete the Punnett square and pedigree
Directions: Answer the following questions and complete the Punnett Squares and Pedigree Charts.
chart for all mentioned in the story.
Autosomal Recessive Inheritance
Draw your Punnett Square below
Draw your pedigree chart below
1) Mendel noticed that when a tall (T) plant and a short (t) plant were crossed, all the offspring were tall in height.
Cross a heterozygous tall plant with a short plant. Complete the Punnett square below to support your answer.
a. What are the genotypes of each parent? _________________
b. Which trait is dominant? _____________________________
2) What is the probability of getting a:
c. Tall pea plant? ________________
d. Hybrid pea plant? _____________
a. What is the genotype of Marge? ________ Homer? ________
e. Purebred plant? ______________
7) What is the probability of getting a:
3) Find the following ratios:
b. Daughter with hemophilia? ________________________ c. Carrier? ________________________________
a. Genotypic: __________________________________ b. Phenotypic: ___________________________________
d. Son with hemophilia? ____________________________ e. Healthy child? ___________________________
4) Phenylketonuria (PKU) is a recessive condition where sufferers lack an enzyme to break down tyrosine in their diet.
8) Can males be carriers of sex‐linked traits? Explain:
This condition, if left untreated, causes brain damage and retardation. Both Rita and Dexter are carriers of this
disorder and do not suffer from any symptoms. Their son, however, has PKU. Complete the Punnett square and
__________________________________________________________________________________________
pedigree chart for all mentioned in the story).
__________________________________________________________________________________________
Draw your Punnett Square below
Draw your pedigree chart below
9) Duchene Muscular Dystrophy (DMD) is a sex‐linked recessive disorder found on the X chromosome. Sufferers with
d
DMD (X
) lack the protein called dystrophin. Because sufferers lack this protein, their muscle cells wear away sooner
than those unaffected causing early death. Abby is homozygous recessive for DMD and Ray is healthy. They want to
know, if they have a son, what his genotype will be? Create a Punnett square & pedigree chart for all mentioned in
the story.
Draw your Punnett Square below
Draw your pedigree chart below
a. What are the phenotypes of each parent? ______________
5) What is the probability of getting:
b. Two healthy children? ______________________ c. A child who carries the disorder? __________________
a. What is the genotype of Abby? _________ Ray? _________
10) What is the probability of getting a:
d. A child who has PKU? ____________________ e. A Homozygous recessive child? ______________________
b. A child with DMD? _____________ c. Girl with DMD? ____________ d. Homozygous child?_____________
f. If their child is a carrier of PKU, does this mean the child has the disorder? Explain: _____________________
e. If this couple has a boy, what are the chances that the boy will have DMD? ___________________________
__________________________________________________________________________________________
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