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Practice Reading Pedigree Charts - 15 pts

Last updated over 6 years ago
20 questions
Note from the author:
Practice worksheet reading a pedigree chart.
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Last Name, First Name

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Class Period

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Date

PROCEDURE: Study the Pedigree Chart that shows a family’s pattern of inheritance for eye color.
Non-blue eye color (B) is dominant to blue (b) eye color.
Answer the questions in the Data Chart based on the Pedigree Chart.

REMEMBER:
  • Dominant: traits (non-blue eyes) are either homozygous dominant alleles (BB) or heterozygous (Bb, has a dominant allele and a recessive allele).
  • Recessive: traits (blue eyes) can only be homozygous alleles (bb) for the recessive trait.
  • Homozygous: means same alleles
  • Heterozygous: means two different alleles
REMEMBER:
Genotype: allele or genetics of the individual (BB, Bb, or bb)
Phenotype: physical appearance based on dominate/recessive alleles (blue or non-blue eyes)
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Number of generations (give answer as a number)

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Number of children that individuals 1 & 2 had in generation I.

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Number of female children from parents 1 & 2 in generation I.

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Number of male children from parents 1 & 2 in generation I.

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Number of individuals in generation II that have blue eyes.

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Daughter #1 in generation II must have received which allele (B or b) from her Dad?

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Number of individuals in generation II that are carriers.

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Genotype for individual 4 in generation II.

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Phenotype for individual 3 in generation II.

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Number of females in generation III.

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Number of female offspring individuals 1 & 2 had in generation II.

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Number of individuals in generation III that have non-blue eyes.

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Number of individuals in generation III that are carriers.

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Genotype for individual 1 in generation III.

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Genotype for individual 7 in generation III.

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Phenotype for individual 7 in generation III.

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Individual 7 in generation III must have received a (B or b) allele from both of her parents.