Heredity worksheet for learning Mendelian genetics and Punnett squares.

Problem Analysis:

The task involves understanding and applying concepts of genetics, specifically focusing on phenotypes, genotypes, dominance/recessiveness, and probability in inheritance. Let's break it down step by step.

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Part I: Phenotype or Genotype

We are asked to determine whether the given terms describe a phenotype (observable trait) or a genotype (genetic makeup). We will fill in the appropriate abbreviation ("P" for phenotype or "G" for genotype) in the space provided.

#### Given Terms:
1. Heterozygous: This refers to an organism having two different alleles for a gene (e.g., Aa). It is a description of the genetic makeup, so it is a genotype.
- Answer: G

2. Tall plants: This describes the observable height of plants, which is a physical trait. It is a phenotype.
- Answer: P

3. Long tongues: This describes the observable length of tongues, which is a physical trait. It is a phenotype.
- Answer: P

4. Non-mendelian inheritance: This refers to patterns of inheritance that do not follow Mendel's laws, describing how traits are passed down genetically. It is a genotype concept.
- Answer: G

5. Curly tails: This describes the observable shape of tails, which is a physical trait. It is a phenotype.
- Answer: P

6. Specified for: This term is related to specifying traits based on genetic information, which is a genotype concept.
- Answer: G

7. Homologous chromosomes: These are chromosomes that pair during meiosis and carry the same genes but may have different alleles. This is a genotype concept.
- Answer: G

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Part II: Homozygous Dominant, Homozygous Recessive, or Heterozygous

We are given three genotypes (Aa, BB, CC) and need to classify each as homozygous dominant (HD), homozygous recessive (HR), or heterozygous (HT).

#### Definitions:
- Homozygous Dominant (HD): Both alleles are the same and dominant (e.g., AA, BB).
- Homozygous Recessive (HR): Both alleles are the same and recessive (e.g., aa, bb).
- Heterozygous (HT): The alleles are different (e.g., Aa, Bb).

#### Classification:
1. Aa: The alleles are different (one dominant, one recessive). This is heterozygous (HT).
- Answer: HT

2. BB: Both alleles are the same and dominant. This is homozygous dominant (HD).
- Answer: HD

3. CC: Both alleles are the same and dominant. This is homozygous dominant (HD).
- Answer: HD

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Part III: Dominant or Recessive

We are given three traits (tall stems, red flowers, and green pods) and need to determine whether they are expressed by a dominant (D) or recessive (R) allele.

#### Assumptions:
- Typically, in classical genetics problems, traits like tall stems, red flowers, and green pods are considered dominant unless specified otherwise.

#### Classification:
1. Tall stems: Generally, tall stems are dominant over short stems.
- Answer: D

2. Red flowers: Generally, red flowers are dominant over white or other colors.
- Answer: D

3. Green pods: Generally, green pods are dominant over yellow pods.
- Answer: D

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Part IV: A Problem

We are tasked with determining the percentage of offspring that will exhibit the tall phenotype when a homozygous dominant plant (TT) is crossed with a heterozygous plant (Tt).

#### Steps:
1. Identify the genotypes:
- Parent 1: TT (homozygous dominant)
- Parent 2: Tt (heterozygous)

2. Create a Punnett square:
- Parent 1 contributes either T.
- Parent 2 contributes either T or t.
- Possible combinations: TT, Tt, TT, Tt.

| | T | t |
|---|---|---|
| T | TT | Tt |
| T | TT | Tt |

3. Analyze the genotypes:
- All offspring (TT, Tt) will have at least one dominant allele (T), meaning all will exhibit the tall phenotype.

4. Calculate the percentage:
- Since all offspring (100%) will be tall, the percentage is 100%.

- Answer: 100%

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Part V: Rabbit Coat Color

We are tasked with determining the possible genotype(s) of a rabbit that has white fur, given that white fur is dominant over black fur.

#### Steps:
1. Define the alleles:
- Let \( W \) represent the dominant allele for white fur.
- Let \( w \) represent the recessive allele for black fur.

2. Possible genotypes for white fur:
- Since white fur is dominant, a rabbit with white fur can have either:
- \( WW \) (homozygous dominant)
- \( Ww \) (heterozygous)

3. Conclusion:
- The possible genotypes for the rabbit with white fur are \( WW \) or \( Ww \).

- Answer: WW or Ww

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Final Answers:

1. Part I:
- Heterozygous: G
- Tall plants: P
- Long tongues: P
- Non-mendelian inheritance: G
- Curly tails: P
- Specified for: G
- Homologous chromosomes: G

2. Part II:
- Aa: HT
- BB: HD
- CC: HD

3. Part III:
- Tall stems: D
- Red flowers: D
- Green pods: D

4. Part IV:
- Percentage of tall offspring: 100%

5. Part V:
- Possible genotypes for the rabbit: WW or Ww

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Boxed Final Answer:

\[
\boxed{100\%}
\]