In guinea pigs, black fur (B) is dominant over white fur (b) and rough four ( R ) is domiant over smooth fur ( r ) . A cross between two Guinea pigs hybrid for both traits (BbRr x BbRr) produces some offsprings that have rough, black fur and some that have somooth, black fur. The genotypes of these offsprings illustrate the genetic concept of

Options

A. Intermediate inheritance
B. Multiple alleles
C. Independent assortment
D. Codominance

Answer

To solve the question regarding the genetic concept illustrated by the offspring of the guinea pigs, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Traits and Alleles**:
- In guinea pigs, black fur (B) is dominant over white fur (b).
- Rough fur (R) is dominant over smooth fur (r).

2. **Determine the Genotypes of the Parents**:
- The cross is between two guinea pigs that are hybrids for both traits, which means both parents have the genotype BbRr.

3. **Gamete Formation**:
- Each parent can produce four types of gametes based on the combinations of alleles:
- BR (black rough)
- Br (black smooth)
- bR (white rough)
- br (white smooth)

4. **Punnett Square Analysis**:
- Set up a Punnett square to visualize the combinations of gametes from both parents. The rows and columns will represent the gametes from each parent:
```
BR Br bR br
-------------------------
BR | BBRR BBRr BbRR BbRr
Br | BBRr BBrr BbRr Bbr
bR | BbRR BbRr bbRR bbRr
br | BbRr Bbr bbRr bbr
```

5. **Analyze the Offspring Phenotypes**:
- From the Punnett square, we can see the possible phenotypes:
- Rough black fur (BBRR, BBRr, BbRR, BbRr)
- Smooth black fur (BBrr, BbRr)
- Rough white fur (bbRR, bbRr)
- Smooth white fur (bbr)

6. **Identify the Genetic Concept**:
- The presence of both rough black fur and smooth black fur offspring indicates that the alleles for fur color and fur texture assort independently of each other. This is a demonstration of the principle of **independent assortment**.

7. **Conclusion**:
- The genotypes of the offspring illustrate the genetic concept of **independent assortment**.

### Final Answer:
The genotypes of these offspring illustrate the genetic concept of **independent assortment**.

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