In rabbits, short hair (S) is dominant over lang hair (s). What genotype and phenotype ratios are expected from a cross between two heterozygous shorthaired rabbits? P Genotypic Ratio: Phenotypic Ratio: 1

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### Problem #1

**Question:**
In rabbits, short hair (S) is dominant over long hair (s). What genotype and phenotype ratios are expected from a cross between two heterozygous shorthaired rabbits?

**Parent Generation (P) Cross:**
\[ P_{\text{generation}}: \text{Heterozygous Short Hair (Ss)} \times \text{Heterozygous Short Hair (Ss)} \]

**Punnett Square:**

The Punnett square below is used to illustrate the potential genetic combinations resulting from this cross. Each box represents a possible genotype for the offspring.

\[ \begin{array}{c|c|c}
 & S & s \\
\hline
S & SS & Ss \\
\hline
s & Ss & ss \\
\end{array} \]

**Explanation:**
- The Punnett square shows four possible genotypes: SS, Ss, Ss, and ss.
- Each box represents a 25% probability of that genotype appearing in the offspring.

**Genotypic Ratio:**
The genotypic ratio is the ratio of different genetic combinations in the offspring.
- **SS:** 1 (25%)
- **Ss:** 2 (50%)
- **ss:** 1 (25%)
So, the genotypic ratio is 1:2:1.

**Phenotypic Ratio:**
The phenotypic ratio is the ratio of observable traits in the offspring.
- **Short hair (dominant, S):** This includes both homozygous dominant (SS) and heterozygous (Ss). There are 3 combinations with short hair.
- **Long hair (recessive, s):** This is homozygous recessive (ss). There is 1 combination with long hair.
So, the phenotypic ratio is 3:1.

**Summary:**
- **Genotypic Ratio:** 1 (SS): 2 (Ss): 1 (ss)
- **Phenotypic Ratio:** 3 (Short hair): 1 (Long hair)

This ratio shows the expected distribution of genotypes and related phenotypes in the rabbit offspring when two heterozygous short-haired rabbits are crossed.
Transcribed Image Text:### Problem #1 **Question:** In rabbits, short hair (S) is dominant over long hair (s). What genotype and phenotype ratios are expected from a cross between two heterozygous shorthaired rabbits? **Parent Generation (P) Cross:** \[ P_{\text{generation}}: \text{Heterozygous Short Hair (Ss)} \times \text{Heterozygous Short Hair (Ss)} \] **Punnett Square:** The Punnett square below is used to illustrate the potential genetic combinations resulting from this cross. Each box represents a possible genotype for the offspring. \[ \begin{array}{c|c|c} & S & s \\ \hline S & SS & Ss \\ \hline s & Ss & ss \\ \end{array} \] **Explanation:** - The Punnett square shows four possible genotypes: SS, Ss, Ss, and ss. - Each box represents a 25% probability of that genotype appearing in the offspring. **Genotypic Ratio:** The genotypic ratio is the ratio of different genetic combinations in the offspring. - **SS:** 1 (25%) - **Ss:** 2 (50%) - **ss:** 1 (25%) So, the genotypic ratio is 1:2:1. **Phenotypic Ratio:** The phenotypic ratio is the ratio of observable traits in the offspring. - **Short hair (dominant, S):** This includes both homozygous dominant (SS) and heterozygous (Ss). There are 3 combinations with short hair. - **Long hair (recessive, s):** This is homozygous recessive (ss). There is 1 combination with long hair. So, the phenotypic ratio is 3:1. **Summary:** - **Genotypic Ratio:** 1 (SS): 2 (Ss): 1 (ss) - **Phenotypic Ratio:** 3 (Short hair): 1 (Long hair) This ratio shows the expected distribution of genotypes and related phenotypes in the rabbit offspring when two heterozygous short-haired rabbits are crossed.
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