If the number of dyads at each pole during Anaphase-I is 25 the gametes will contain how many chromosomes?

Options

A. 25
B. 50
C. 100
D. None of above

Answer

To solve the question, "If the number of dyads at each pole during Anaphase-I is 25, how many chromosomes will the gametes contain?", we can follow these steps:

### Step 1: Understand the Definition of Dyad
A dyad consists of a pair of homologous chromosomes, which are made up of two sister chromatids. During Anaphase-I of meiosis, these dyads separate and move towards opposite poles.

**Hint:** Remember that a dyad represents a pair of chromosomes, and each chromosome in a dyad has two sister chromatids.

### Step 2: Identify the Number of Dyads
According to the question, there are 25 dyads at each pole during Anaphase-I. This means that there are 25 pairs of homologous chromosomes.

**Hint:** The term "dyad" indicates that we are dealing with pairs of chromosomes.

### Step 3: Calculate the Total Number of Chromosomes
Since each dyad consists of 2 chromosomes (one from each homologous pair), the total number of chromosomes at each pole can be calculated as follows:
- Total chromosomes at one pole = Number of dyads × 2
- Total chromosomes at one pole = 25 dyads × 2 = 50 chromosomes.

**Hint:** Always remember that each dyad corresponds to two chromosomes.

### Step 4: Determine the Chromosome Count in Gametes
Meiosis is a reductional division, meaning that the diploid number of chromosomes (2n) is halved to form haploid gametes (n). Since we have established that there are 50 chromosomes in the diploid cell (2n = 50), the number of chromosomes in each gamete will be:
- Gametes = Total chromosomes / 2 = 50 / 2 = 25 chromosomes.

**Hint:** The gametes are haploid, so they will have half the number of chromosomes compared to the diploid parent cell.

### Conclusion
Thus, the gametes will contain **25 chromosomes**.

**Final Answer:** 25 chromosomes.