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Meiosis and mitosis are found to be the ...

Meiosis and mitosis are found to be the two types of cell division . A cell is observed to have 50 chromosomes in its nucleus during interphase before entering S-phase . How many chromosomes will it have after undergoing division by the two - division process ?
`{:(,"Meiosis","Mitosis"),(1,100,25),(2,50,50),(3,50,100),(4,25,50):}`

A

1

B

2

C

3

D

4

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the number of chromosomes after a cell undergoes meiosis and mitosis, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Initial Number of Chromosomes**: - The cell is observed to have **50 chromosomes** during interphase before entering the S-phase. 2. **Understand the S-phase**: - The S-phase is where DNA replication occurs. This means that the number of chromosomes will double because each chromosome is replicated into two sister chromatids. - After the S-phase, the cell will have **100 chromatids**, but the number of chromosomes remains **50** because chromosomes are still counted as a single unit until they are separated during cell division. 3. **Mitosis Process**: - Mitosis is an equational division, meaning that the daughter cells will have the same number of chromosomes as the parent cell. - Therefore, after undergoing mitosis, the two daughter cells will each have **50 chromosomes**. 4. **Meiosis Process**: - Meiosis is a reductional division, which means that the number of chromosomes is halved. - Starting with the original 50 chromosomes, after meiosis, the daughter cells will each have **25 chromosomes**. 5. **Final Count After Both Divisions**: - After undergoing both processes (mitosis and meiosis), we can summarize: - Mitosis results in two daughter cells with **50 chromosomes each**. - Meiosis results in four daughter cells with **25 chromosomes each**. ### Conclusion: - The answer to the question is that after undergoing division by the two-division process (meiosis and mitosis), the cell will have: - **Mitosis: 50 chromosomes** - **Meiosis: 25 chromosomes** ### Answer: - The correct option is **(4, 25, 50)**.
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