In the following pedigree of an X-linked recessive trait, what is the likelihood a child will be affected for the following matings? 1 x 2       [___]  13 x 14       [_____]  2 x 14       [_______]  4 x 12.      [_______]

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In the following pedigree of an X-linked recessive trait, what is the likelihood a child will be affected for the following matings?

1 x 2       [___] 

13 x 14       [_____] 

2 x 14       [_______] 

4 x 12.      [_______]

 

### Pedigree Analysis Diagram

This diagram is a pedigree chart, which is commonly used in genetics to illustrate the inheritance patterns of traits and to track genetic disorders within a family. Here is a detailed explanation of the elements in the pedigree chart:

#### Key:

- **Squares** represent males.
- **Circles** represent females.
- **Filled symbols** (solid black) indicate individuals who are affected by the trait or disorder.
- **Empty symbols** (unfilled or white) indicate individuals who are unaffected.
- **Half-filled symbols** (not shown in this diagram) would indicate carriers of a recessive trait (not applicable in this specific chart).

#### Generations:

Each row of the pedigree chart represents a different generation.

1. **First Generation**:
   - Individual 1 (affected male) and Individual 2 (unaffected female).

2. **Second Generation**:
   - Individuals 3, 4, 5, 6, and 7.
   - Individual 4 is an affected female.
   - Individuals 3, 5, 6 are unaffected.
   - Individual 7 is an affected male.

3. **Third Generation**:
   - Individuals 8, 9, 10, 11, 12, and 13.
   - Individual 8 and 11 are affected males.
   - Individuals 9, 10, 12, and 13 are unaffected.

4. **Fourth Generation**:
   - Individuals 14, 15, and 16.
   - All individuals (14, 15, and 16) are unaffected.

#### Connections:

- A horizontal line connecting a square and a circle represents a mating.
- Vertical lines descending from a pairing connect to their offspring.
- Siblings are connected by a horizontal line above them.

#### Analysis:

This pedigree suggests a pattern of inheritance where the trait could be following a recessive or dominant inheritance pattern, depending upon the specifics of the trait being considered. Notably, by examining the affected and unaffected individuals across generations, geneticists can determine if the trait is autosomal dominant, autosomal recessive, X-linked dominant, or X-linked recessive.

For instance, in this example, there is no consistent sex difference in the affected individuals, suggesting the trait is likely autosomal. If this were discussing human genetic diseases, further genetic testing and historical analysis of family medical records would provide additional insight into the mode of inheritance.

This foundational
Transcribed Image Text:### Pedigree Analysis Diagram This diagram is a pedigree chart, which is commonly used in genetics to illustrate the inheritance patterns of traits and to track genetic disorders within a family. Here is a detailed explanation of the elements in the pedigree chart: #### Key: - **Squares** represent males. - **Circles** represent females. - **Filled symbols** (solid black) indicate individuals who are affected by the trait or disorder. - **Empty symbols** (unfilled or white) indicate individuals who are unaffected. - **Half-filled symbols** (not shown in this diagram) would indicate carriers of a recessive trait (not applicable in this specific chart). #### Generations: Each row of the pedigree chart represents a different generation. 1. **First Generation**: - Individual 1 (affected male) and Individual 2 (unaffected female). 2. **Second Generation**: - Individuals 3, 4, 5, 6, and 7. - Individual 4 is an affected female. - Individuals 3, 5, 6 are unaffected. - Individual 7 is an affected male. 3. **Third Generation**: - Individuals 8, 9, 10, 11, 12, and 13. - Individual 8 and 11 are affected males. - Individuals 9, 10, 12, and 13 are unaffected. 4. **Fourth Generation**: - Individuals 14, 15, and 16. - All individuals (14, 15, and 16) are unaffected. #### Connections: - A horizontal line connecting a square and a circle represents a mating. - Vertical lines descending from a pairing connect to their offspring. - Siblings are connected by a horizontal line above them. #### Analysis: This pedigree suggests a pattern of inheritance where the trait could be following a recessive or dominant inheritance pattern, depending upon the specifics of the trait being considered. Notably, by examining the affected and unaffected individuals across generations, geneticists can determine if the trait is autosomal dominant, autosomal recessive, X-linked dominant, or X-linked recessive. For instance, in this example, there is no consistent sex difference in the affected individuals, suggesting the trait is likely autosomal. If this were discussing human genetic diseases, further genetic testing and historical analysis of family medical records would provide additional insight into the mode of inheritance. This foundational
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