Name ______________________________ Class ___________________ Date __________________
Quick Lab
You will practice interpreting a pedigree. The pedigree to the right shows the presence or absence of the albinism trait in several generations of a family.
K L M N
1. Determine whether the albinism trait is dominant or recessive. Explain your reasoning.
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2. Determine the genotypes for females A & B.
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3. Based upon your conclusion to Question 1 & 2, determine what the genotype is for the parents of Female A and Female B.
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Name ______________________________ Class ___________________ Date __________________
4. Determine the genotypes as many of the family members of this pedigree as possible and label each genotype in the pedigree above. Use the following designations in and place the numbers of each on the lines below:
AA = Homozygous dominant. _________________________________________
Aa = Heterozygous: _________________________________________________ aa = Homozygous recessive: __________________________________________
?? = Not enough information to conclude: ________________________________
5.
Applying Information.
Suppose that Female C is homozygous dominant and produces children with hypothetical Male D. If
Male D is heterozygous, what is the % chance that the children will have the albinism trait? What is the % chance that a child will be a carrier? Complete the Punnet square to show your work.
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6. Analysis.
How does the Punnet square apply to the offspring? For example, if one child matches the genotype of the upper left quadrant of the Punnet square, can the child’s sibling (brother or sister) be the same genotype for the trait or does the Punnet square imply that once the genotype is taken, no other siblings can have that genotype. (See siblings K, L, M, & N). Explain.
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7. Summarize.
Name 2 things that a Pedigree can show you.
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