How many types of gametes will be produced by individuals of AABbcc genotype ?

Options

A. Two
B. Four
C. Six
D. Nine

Answer

To determine how many types of gametes will be produced by individuals with the genotype AABbcc, we can follow these steps:

### Step 1: Identify the Alleles
The genotype AABbcc consists of:
- AAB: This indicates that the individual is homozygous for the A allele (AA) and will only contribute the A allele to the gametes.
- B: This indicates that the individual is heterozygous for the B allele (Bb) and can contribute either the B or the b allele to the gametes.
- cc: This indicates that the individual is homozygous for the c allele (cc) and will only contribute the c allele to the gametes.

### Step 2: Determine the Possible Alleles for Each Gene
From the above genotype:
- For the A gene: Only A (since it is homozygous AA).
- For the B gene: Either B or b (since it is heterozygous Bb).
- For the C gene: Only c (since it is homozygous cc).

### Step 3: Calculate the Number of Gamete Combinations
To find the total number of different types of gametes, we can use the formula:
\[ \text{Number of Gametes} = 2^n \]
where \( n \) is the number of heterozygous gene pairs.

In this case, we have:
- 1 heterozygous pair (Bb) which contributes 2 options (B or b).
- The other two pairs (AA and cc) contribute only 1 option each.

Thus, we have:
\[ \text{Total Gametes} = 1 \times 2 \times 1 = 2 \]

### Step 4: List the Types of Gametes
The two types of gametes produced will be:
1. ABC (from A, B, c)
2. Abc (from A, b, c)

### Conclusion
Therefore, the number of different types of gametes produced by individuals with the genotype AABbcc is **2**.

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