Red seed colour shows an `F_(2)` ratio of 1:4:6:4:1. It is due to

Options

A. Two polygene
B. Different number of dominant genes
C. Different number of recessive genes
D. Supplementary genes.

Answer

To solve the question regarding the inheritance of red seed color showing an F2 ratio of 1:4:6:4:1, we can follow these steps:

### Step 1: Understand the F2 Ratio
The given F2 ratio is 1:4:6:4:1. This ratio indicates that there are multiple phenotypic expressions in the offspring, which suggests that more than one gene is involved in determining the trait.

**Hint:** Look for ratios that indicate polygenic inheritance, which often results in a bell-shaped curve of phenotypic variation.

### Step 2: Identify Polygenic Inheritance
In polygenic inheritance, two or more genes contribute to a single trait. The combined effect of these genes leads to a range of phenotypes. The ratio 1:4:6:4:1 is characteristic of traits controlled by two polygenes, where each gene has a small additive effect.

**Hint:** Remember that polygenic traits typically show continuous variation and can produce a range of phenotypes.

### Step 3: Analyze the Options
The options provided are:
1. Two polygenes
2. Different sets of dominant genes
3. Different number of recessive genes
4. Supplementary genes

Since the ratio indicates a combination of effects from multiple genes, the most appropriate option is "two polygenes."

**Hint:** Consider how the presence of dominant or recessive genes would affect the ratio. A simple Mendelian ratio would not produce such a diverse range.

### Step 4: Conclusion
The red seed color showing the F2 ratio of 1:4:6:4:1 is due to the interaction of two polygenes. These genes have small effects individually, but together they create a significant phenotypic variation.

**Final Answer:** The red seed color shows this ratio due to two polygenes.

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