Grade 8 Science: Pedigree Charts
This worksheet focuses on understanding and analyzing pedigree charts, including identifying inheritance patterns and genotypes.
Includes
Standards
Topics
Grade 8 Science: Pedigree Charts
Name:
Date:
Score:
Read each question carefully and answer to the best of your ability. Refer to the provided pedigree chart for questions 1-4.
Use the pedigree chart below to answer the following questions.
1. How many generations are represented in this pedigree chart?
2. Is the trait shown in the pedigree chart dominant or recessive? Explain your reasoning.
3. What is the genotype of individual II-3 if the trait is recessive (use 'A' for dominant and 'a' for recessive)?
4. If individuals III-1 and III-2 have another child, what is the probability that this child will express the trait?
Complete the following sentences using the correct terminology.
5. In a pedigree chart, a square represents a and a circle represents a .
6. A shaded shape in a pedigree chart indicates an individual who the trait.
7. A horizontal line connecting a male and female indicates a .
8. Vertical lines extending downward from a marriage line connect to their .
9. Which of the following best describes a carrier in a pedigree chart?
An individual who expresses the trait.
An individual who does not express the trait but carries the allele.
An individual who has two dominant alleles.
An individual who has no alleles for the trait.
10. In a pedigree showing an X-linked recessive trait, which gender is typically affected more often?
Males
Females
Both equally
Neither
11. Explain the difference between an autosomal trait and an X-linked trait in terms of how they are inherited.