Practice Reading Pedigree Charts - 15 pts
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by Kathy Egbert
| 20 Questions
Note from the author:
Practice worksheet reading a pedigree chart.
1
0
Last Name, First Name
2
0
Class Period
A A1
B A2
C A4
D A7
E A8
3
0
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)
4
1
Number of generations (give answer as a number)
5
1
Number of children that individuals 1 & 2 had in generation I.
6
1
Number of female children from parents 1 & 2 in generation I.
7
1
Number of male children from parents 1 & 2 in generation I.
8
1
Number of individuals in generation II that have blue eyes.
9
1
Daughter #1 in generation II must have received which allele (B or b) from her Dad?
10
1
Number of individuals in generation II that are carriers.
11
1
Genotype for individual 4 in generation II.
12
1
Phenotype for individual 3 in generation II.
13
1
Number of females in generation III.
14
1
Number of female offspring individuals 1 & 2 had in generation II.
15
1
Number of individuals in generation III that have non-blue eyes.
16
1
Number of individuals in generation III that are carriers.
17
1
Genotype for individual 1 in generation III.
18
1
Genotype for individual 7 in generation III.
19
1
Phenotype for individual 7 in generation III.
20
1
Individual 7 in generation III must have received a (B or b) allele from both of her parents.
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