To determine the phenotype ratio resulting from the cross between an Agouti rabbit (Cch) and a Chinchilla rabbit (Cchc), we first need to understand the genetic makeup of the rabbits involved.
The Agouti rabbit has the genotype Cch, exhibiting the Agouti color pattern. The Chinchilla rabbit has the genotype Cchc, which displays the Chinchilla pattern. The alleles are ordered by dominance as follows: C (albino) > Cch (chinchilla) > Ch (himalayan) > c (agouti).
Now, let’s set up a Punnett square for this cross:
- Agouti (Cch) contributes either Cch or Cch.
- Chinchilla (Cchc) contributes either Cch or c.
Setting this up, we get:
| Cch | c | |
| Cch | CchCch (Agouti) | Cchc (Chinchilla) |
| Cch | CchCch (Agouti) | Cchc (Chinchilla) |
From the Punnett square, we can summarize the phenotypes:
- 2 Agouti (CchCch)
- 2 Chinchilla (Cchc)
This gives us a final phenotype ratio of:
Phenotype Ratio: 2 Agouti : 2 Chinchilla
Or simplified, the ratio is:
1 Agouti : 1 Chinchilla
In conclusion, crossing an Agouti rabbit with a Chinchilla rabbit results in a phenotype ratio of 1:1 between Agouti and Chinchilla rabbits.