Among butterfly, pigeon, horse and goat, which one has the highest chromosome number in gametes ?

Options

A. Butterfly
B. Pigeon
C. Horse
D. Goat

Answer

To determine which organism among the butterfly, pigeon, horse, and goat has the highest chromosome number in gametes, we can follow these steps:

### Step 1: Understand Gametes and Chromosome Numbers
Gametes are the reproductive cells (sperm and eggs) that are haploid, meaning they contain half the number of chromosomes compared to somatic (body) cells. The chromosome number in gametes is derived from the diploid number of chromosomes present in the organism's somatic cells through a process called meiosis.

### Step 2: Identify the Diploid Chromosome Numbers
We need to know the diploid chromosome numbers for each of the organisms:
- **Butterfly**: Diploid = 38
- **Pigeon**: Diploid = 80
- **Horse**: Diploid = 64
- **Goat**: Diploid = 60

### Step 3: Calculate the Haploid Chromosome Numbers
To find the haploid number (chromosome number in gametes), we divide the diploid number by 2:
- **Butterfly**: Haploid = 38 / 2 = 19
- **Pigeon**: Haploid = 80 / 2 = 40
- **Horse**: Haploid = 64 / 2 = 32
- **Goat**: Haploid = 60 / 2 = 30

### Step 4: Compare the Haploid Numbers
Now, we compare the haploid numbers obtained:
- Butterfly: 19
- Pigeon: 40
- Horse: 32
- Goat: 30

### Step 5: Identify the Highest Number
From the comparison, the pigeon has the highest haploid chromosome number, which is 40.

### Conclusion
Therefore, among the butterfly, pigeon, horse, and goat, the organism with the highest chromosome number in gametes is the **pigeon**.

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