A cross like this (between two individuals heterozygous for two traits) is often referred to as a "two-point test cross". The expected ratio of phenotypes if the two traits are caused by unlinked genes displaying simple Mendelian dominant inheritance is 9:3:3:1. For this ratio, match each term of the ratio with the appropriate phenotype Wrinkled and green peas 1. 9 Round and yellow peas 2. 3 Round and green peas 3. 1 Wrinkled and yellow peas > > >

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### Two-Point Test Cross and Mendelian Ratio

**Introduction**

A cross between two individuals heterozygous for two traits is often referred to as a "two-point test cross." This type of genetic cross is used to determine the expected ratio of phenotypes, assuming the traits are caused by unlinked genes displaying simple Mendelian inheritance patterns. Specifically, the ratio for phenotypes in such a cross is expected to be 9:3:3:1.

### Matching Phenotypes to the Mendelian Ratio

Given the 9:3:3:1 ratio, match each term of the ratio with the appropriate phenotype:

1. **9 parts**:
   - **Round and yellow peas**
2. **3 parts**:
   - **Wrinkled and yellow peas**
3. **3 parts**:
   - **Round and green peas**
4. **1 part**:
   - **Wrinkled and green peas**

### Summary

In a typical dihybrid cross scenario where the genes for the traits assort independently (unlinked), the phenotypes appear in the ratio of 9:3:3:1. This means out of 16 possible offspring, 9 will show both dominant traits, 3 will show the dominant trait for one gene and the recessive trait for the other, another 3 will show the alternate combination, and only 1 will show both recessive traits. These ratios help in predicting genetic outcomes and studying inheritance patterns.
Transcribed Image Text:### Two-Point Test Cross and Mendelian Ratio **Introduction** A cross between two individuals heterozygous for two traits is often referred to as a "two-point test cross." This type of genetic cross is used to determine the expected ratio of phenotypes, assuming the traits are caused by unlinked genes displaying simple Mendelian inheritance patterns. Specifically, the ratio for phenotypes in such a cross is expected to be 9:3:3:1. ### Matching Phenotypes to the Mendelian Ratio Given the 9:3:3:1 ratio, match each term of the ratio with the appropriate phenotype: 1. **9 parts**: - **Round and yellow peas** 2. **3 parts**: - **Wrinkled and yellow peas** 3. **3 parts**: - **Round and green peas** 4. **1 part**: - **Wrinkled and green peas** ### Summary In a typical dihybrid cross scenario where the genes for the traits assort independently (unlinked), the phenotypes appear in the ratio of 9:3:3:1. This means out of 16 possible offspring, 9 will show both dominant traits, 3 will show the dominant trait for one gene and the recessive trait for the other, another 3 will show the alternate combination, and only 1 will show both recessive traits. These ratios help in predicting genetic outcomes and studying inheritance patterns.
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