Percentage of heterozygous individuals obtained from selfing Rr individuals is:

Options

A. 100
B. 75
C. 50
D. 25

Answer

To find the percentage of heterozygous individuals obtained from selfing Rr individuals, we can follow these steps:

### Step 1: Understand the Genotypes
When we self-fertilize Rr individuals, we are looking at the offspring produced from two heterozygous parents (Rr x Rr).

### Step 2: Set Up a Punnett Square
To visualize the genetic combinations, we can create a Punnett square:
- The alleles from one parent (Rr) are placed on the top: R and r.
- The alleles from the other parent (Rr) are placed on the side: R and r.

The Punnett square will look like this:

```
R r
------------
R | RR | Rr |
------------
r | Rr | rr |
------------
```

### Step 3: Analyze the Offspring Genotypes
From the Punnett square, we can see the possible genotypes of the offspring:
- 1 RR (homozygous dominant)
- 2 Rr (heterozygous)
- 1 rr (homozygous recessive)

### Step 4: Calculate the Ratios
The ratio of the genotypes is:
- 1 RR : 2 Rr : 1 rr

### Step 5: Determine the Percentage of Heterozygous Individuals
To find the percentage of heterozygous individuals (Rr), we take the number of heterozygous individuals (2) and divide it by the total number of individuals (4):
- Percentage of heterozygous individuals = (Number of Rr / Total Offspring) × 100
- Percentage of heterozygous individuals = (2 / 4) × 100 = 50%

### Conclusion
The percentage of heterozygous individuals obtained from selfing Rr individuals is 50%.

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