Coloured seed coat (S) is dominant over white seed coat (s). When a white seed coat (ss) plant is crossed with coloured seed coat (Ss) plant the seed coat colour of newly developed plant will be

Options

A. White
B. Coloured
C. Coloured and white in the ratio of 1:1
D. Mosaic

Answer

To solve the problem of determining the seed coat color of the newly developed plants when a white seed coat (ss) plant is crossed with a colored seed coat (Ss) plant, we can follow these steps:

### Step 1: Identify the Genotypes
- The genotype of the white seed coat plant is **ss** (homozygous recessive).
- The genotype of the colored seed coat plant is **Ss** (heterozygous).

### Step 2: Determine the Gametes
- The white seed coat plant (ss) can only produce one type of gamete: **s**.
- The colored seed coat plant (Ss) can produce two types of gametes: **S** and **s**.

### Step 3: Set Up the Punnett Square
- We can set up a Punnett square to visualize the potential offspring from the cross.

```
S s
----------------
s | Ss | ss |
----------------
s | Ss | ss |
----------------
```

### Step 4: Analyze the Offspring
- From the Punnett square, we can see the possible genotypes of the offspring:
- **Ss** (colored seed coat)
- **ss** (white seed coat)

### Step 5: Count the Ratios
- The genotypes from the Punnett square show:
- 2 offspring with genotype **Ss** (colored seed coat)
- 2 offspring with genotype **ss** (white seed coat)

Thus, the ratio of colored to white seed coat plants is **1:1**.

### Conclusion
The seed coat color of the newly developed plants will be in the ratio of **1 colored (Ss) : 1 white (ss)**.

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