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
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
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
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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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6a9061e8-d4de-400c-86e2-4b07ccad08d9%2F4e001ed6-b289-4b3b-92ed-ff537f3edd2f%2Fg8cxljd_processed.jpeg&w=3840&q=75)
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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