Question

After meiosis I, the resultant daughter cells have

• A. Same amount of DNA as in the parent cell in S phase
• B. Twice the amount of DNA in comparison to haploid gamete.
• C. Same amount of DNA in comparison to haploid gamete
• D. Four times the amount of DNA in comparison to haploid gamete

Answer 1

The Correct Option is B

To understand the DNA content in the daughter cells after meiosis I, let's first explore the process of meiosis.

Meiosis is a type of cell division that reduces the chromosome number by half, crucial for the formation of gametes in sexually reproducing organisms. It consists of two rounds of division, meiosis I and meiosis II.

Now, let's consider the options given:

1. Same amount of DNA as in the parent cell in S phase.

   This option is incorrect. During the S phase, the DNA is duplicated in the parent cell. After meiosis I, cells have not yet undergone DNA replication, so they do not retain the DNA amount from the S phase.

2. Twice the amount of DNA in comparison to haploid gamete.

   This is the correct answer. Meiosis I is a reductional division where homologous chromosomes are separated, resulting in daughter cells that have half the number of chromosomes compared to the parent cell. However, each chromosome still consists of two sister chromatids, meaning the DNA content is twice that of a haploid cell.

3. Same amount of DNA in comparison to haploid gamete.

   This option is incorrect because the daughter cells after meiosis I still maintain duplicated chromosomes (though in reduced number), so they hold twice the DNA content compared to haploid gametes.

4. Four times the amount of DNA in comparison to haploid gamete.

   This option is incorrect because such a high DNA content would have been observed in the parent cell during the S phase, not after meiosis I.

Therefore, after meiosis I, the resultant daughter cells have twice the amount of DNA in comparison to haploid gametes.