If a agouti mice (CcAa) is crossed with albino mice (ccAA), then how many albino mice are produced in resulting progeny ?

Options

A. 4
B. 9
C. 2
D. 3

Answer

To solve the problem of how many albino mice are produced when an agouti mouse (CcAa) is crossed with an albino mouse (ccAA), we can follow these steps:

### Step 1: Determine the Genotypes of the Parents
- The agouti mouse has the genotype CcAa (heterozygous for both traits).
- The albino mouse has the genotype ccAA (homozygous recessive for color and homozygous dominant for the other trait).

### Step 2: Identify the Gametes Produced by Each Parent
- The agouti mouse (CcAa) can produce four types of gametes:
1. CA (C and A)
2. Ca (C and a)
3. cA (c and A)
4. ca (c and a)

- The albino mouse (ccAA) can only produce one type of gamete:
1. cA (c and A)

### Step 3: Create a Punnett Square
- Set up a Punnett square to visualize the combinations of gametes from both parents.

| | cA |
|---------|----------|
| **CA** | CcAA |
| **Ca** | CcAa |
| **cA** | ccAA |
| **ca** | ccAa |

### Step 4: Determine the Genotypes of the Offspring
- From the combinations in the Punnett square, we can determine the genotypes of the offspring:
1. CcAA (Agouti)
2. CcAa (Agouti)
3. ccAA (Albino)
4. ccAa (Albino)

### Step 5: Identify the Phenotypes of the Offspring
- The phenotypes corresponding to the genotypes are:
- CcAA: Agouti
- CcAa: Agouti
- ccAA: Albino
- ccAa: Albino

### Step 6: Count the Number of Albino Mice
- From the genotypes, we see that there are 2 offspring with the albino phenotype (ccAA and ccAa).

### Conclusion
- Therefore, the number of albino mice produced in the resulting progeny is **2**.

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