The characteristic of albinism (lack of pigment in skin and hair), can be caused by a single gene. The following pedigree shows a family in which some people are affected by albinism. 3 1 2 3 4 6 7 8 II 3 5 6 IV 1 a. Using just the information on this pedigree, is albinism caused by a dominant allele or recessive alleles? b. What are the genotypes of the great-grandparents (generation I)?

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### Understanding Albinism Through Pedigree Analysis

**16. The characteristic of albinism**, which results in a lack of pigment in the skin and hair, can be attributed to a single gene. Presented below is a family pedigree illustrating how albinism affects certain individuals within the family.

#### Pedigree Diagram

- **Symbols**:
  - Squares represent males.
  - Circles represent females.
  - Filled symbols indicate individuals affected by albinism.
  - Unfilled symbols indicate unaffected individuals.
  
- **Generations**:
  - The pedigree is divided into four generations labeled I through IV.
  - Individuals in each generation are numbered for reference (e.g., II-1).

#### Analysis Questions

**a. Genetic Basis of Albinism**  
- Using just the information in this pedigree, is albinism caused by a dominant allele or recessive alleles?

**b. Genotype Inference**  
- What are the genotypes of the great-grandparents (Generation I)?

Through analyzing the pattern of inheritance shown in the pedigree, students can infer whether the albinism trait follows a dominant or recessive inheritance pattern and determine possible genotypes for the ancestors.
Transcribed Image Text:### Understanding Albinism Through Pedigree Analysis **16. The characteristic of albinism**, which results in a lack of pigment in the skin and hair, can be attributed to a single gene. Presented below is a family pedigree illustrating how albinism affects certain individuals within the family. #### Pedigree Diagram - **Symbols**: - Squares represent males. - Circles represent females. - Filled symbols indicate individuals affected by albinism. - Unfilled symbols indicate unaffected individuals. - **Generations**: - The pedigree is divided into four generations labeled I through IV. - Individuals in each generation are numbered for reference (e.g., II-1). #### Analysis Questions **a. Genetic Basis of Albinism** - Using just the information in this pedigree, is albinism caused by a dominant allele or recessive alleles? **b. Genotype Inference** - What are the genotypes of the great-grandparents (Generation I)? Through analyzing the pattern of inheritance shown in the pedigree, students can infer whether the albinism trait follows a dominant or recessive inheritance pattern and determine possible genotypes for the ancestors.
### Genetics Discussion and Analysis

**c. What are the genotypes of the grandparents (II-4 and II-5)?**

**d. Can you determine the genotype of II-5 without knowing that they had an affected child? What are the possible genotypes for II-5 without this information?**

**e. What are the genotypes of the parents (III-5 and III-6)?**

This segment explores the genetic inheritance patterns within a family, focusing on determining the genotypes of specific family members. The questions aim to analyze the potential genetic combinations based on observable traits and inheritance patterns.

No graphs or diagrams are included within the text provided.
Transcribed Image Text:### Genetics Discussion and Analysis **c. What are the genotypes of the grandparents (II-4 and II-5)?** **d. Can you determine the genotype of II-5 without knowing that they had an affected child? What are the possible genotypes for II-5 without this information?** **e. What are the genotypes of the parents (III-5 and III-6)?** This segment explores the genetic inheritance patterns within a family, focusing on determining the genotypes of specific family members. The questions aim to analyze the potential genetic combinations based on observable traits and inheritance patterns. No graphs or diagrams are included within the text provided.
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