Genetics Pedigree Analysis Worksheet focusing on Huntington's Disease, Hitchhiker's thumb, and Colorblindness.

Problem Analysis and Solution

The provided image contains a pedigree analysis worksheet focusing on Huntington's Disease, along with some related questions. Below, I will solve each question step by step, explaining the reasoning behind each answer.

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#### Pedigree Key
- Black-filled circles/squares: Affected individuals (Huntington's Disease)
- Unfilled circles/squares: Unaffected individuals
- Shaded squares/circles: Carriers (not applicable for Huntington's Disease as it is dominant)

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Question 1: Which members of the family above are afflicted with Huntington’s Disease?

#### Solution:
From the pedigree:
- I-1: Affected (black-filled square)
- II-2: Affected (black-filled circle)
- II-3: Affected (black-filled square)
- II-7: Affected (black-filled circle)
- III-3: Affected (black-filled circle)

#### Answer:
\[
\boxed{\text{I-1, II-2, II-3, II-7, III-3}}
\]

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Question 2: There are no carriers for Huntington’s Disease— you either have it or you don’t. With this in mind, is Huntington’s disease caused by a dominant or recessive trait?

#### Solution:
- Huntington's Disease is known to be caused by a dominant allele.
- In a dominant trait, if an individual inherits one copy of the mutant allele, they will express the disease.
- The pedigree shows that affected individuals (e.g., I-1) pass the disease to their offspring (e.g., II-2, II-3), which is consistent with a dominant inheritance pattern.

#### Answer:
\[
\boxed{\text{dominant}}
\]

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Question 3: How many children did individuals I-1 and I-2 have?

#### Solution:
- Individuals I-1 and I-2 are the parents in the first generation.
- Their offspring are listed in the second generation (II).
- Counting the individuals in the second generation:
- II-1, II-2, II-3, II-4, II-5, II-6, II-7, II-8

There are 8 children in total.

#### Answer:
\[
\boxed{8}
\]

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Question 4: How many girls did II-1 and II-2 have? How many of these daughters have Huntington’s disease?

#### Solution:
- Step 1: Identify the children of II-1 and II-2.
- II-1 and II-2 have two children in the third generation (III):
- III-1 (unaffected male)
- III-2 (unaffected female)
- III-3 (affected female)

- Step 2: Count the number of girls.
- There are 2 girls: III-2 and III-3.

- Step 3: Determine how many of these daughters have Huntington’s disease.
- Only one daughter (III-3) is affected by Huntington’s Disease.

#### Answers:
1. Number of girls: \(\boxed{2}\)
2. Number of daughters with Huntington’s Disease: \(\boxed{1}\)

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Question 5: How are individuals III-2 and II-4 related? I-2 and III-5?

#### Solution:
- Part 1: Relationship between III-2 and II-4
- III-2 is the daughter of II-1 and II-2.
- II-4 is the daughter of I-1 and I-2.
- Since II-1 and II-2 are siblings of II-4, III-2 is the niece of II-4.

- Part 2: Relationship between I-2 and III-5
- I-2 is the mother of II-4 and II-5.
- III-5 is the son of II-4 and II-5.
- Therefore, I-2 is the grandmother of III-5.

#### Answers:
1. III-2 is a niece of II-4.
2. I-2 is a grandmother of III-5.

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Final Answers Summarized:

1. \(\boxed{\text{I-1, II-2, II-3, II-7, III-3}}\)
2. \(\boxed{\text{dominant}}\)
3. \(\boxed{8}\)
4. Number of girls: \(\boxed{2}\), Number of daughters with Huntington’s Disease: \(\boxed{1}\)
5. III-2 is a niece of II-4, I-2 is a grandmother of III-5.

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Second Pedigree Analysis (Not Asked in Questions but Explained for Clarity)

The second pedigree shows another family with individuals affected by a genetic disorder. However, since no specific questions are asked about this pedigree, I will not analyze it further unless requested.

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If you have any additional questions or need further clarification, feel free to ask!