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Chapter 13: 13-4TYU (page 268)

If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at the metaphase of meiosis I will be

  1. 0.25x
  2. 0.5x
  3. x
  4. 2x

Short Answer

Expert verified
  1. The option “0.25x” is false.
  2. The option “0.5x” isfalse.
  3. The option “x” is false.
  4. The option “2x” is true.

Step by step solution

01

Description of meiosis and diploid cell

The cell cycle involves steps such as the G1 phase, synthesis phase, and G2 phase. The G2 phase is followed by the mitosis or meiosis phase. The meiosis process occurs in sperm cells that results in the formation of four haploid daughter cells.

02

Explanation of option (A)

After the metaphase of meiosis, the number of DNA get doubles.

The number of DNA is not reduced for one-fourth time.

Therefore, the given option is false.

03

Explanation of option (B)

The number of DNA gets doubled due to an increase in the number of pairs. The number of DNA does not get reduced to 0.5x.

The value of DNA does not get reduced by half.

Therefore, the given option is false.

04

Explanation of option (C)

The number of DNAs gets doubled in the metaphase stage. The DNA of the G1 phase will not remain the same in the metaphase of meiosis I.

The number of DNA of the same cell will not remain the same after both phases.

Therefore, the given option is false.

05

Explanation of option (D)

In general, meiosis is the process that creates four cells. The metaphase of meiosis involves the alignment of homologous pair of chromosomes on either side of the equatorial plate.

The DNA content also increases twice since there is a formation of chromosomal pairs in the metaphase.

The value of x is the initial DNA content which then increases 2x.

Therefore, the given option is true.

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Most popular questions from this chapter

The continuity of life is based on heritable information in the form of DNA. IN a short essay (100-150 words), explain how chromosome behavior during sexual reproduction in animals ensures the perpetuation of parental traits in offspring and, at the same time, genetic variation among offspring.

Most of the yeast cells in the culture were in G1 of the cell cycle before being moved to the nutrient-poor medium. (a) How many femtograms of DNA are there in each yeast cell in G1? Estimate this value from the data in your graph. (b) How many femtograms of DNA should be present in each cell in G2? (See Concept 12.2 and Figure 12.6.) At the end of meiosis I (MI)? At the end of meiosis II (MII)? (See Figure 13.7.) (c) Using these values as a guideline, distinguish the different phases by inserting vertical dashed lines in the graph between phases and label each phase (G1, S, G2, MI, MII). You can figure out where to put the dividing lines based on what you know about the DNA content of each phase (see Figure 13.7). (d) Think carefully about the point where the line at the highest value begins to slope downward. What specific point of meiosis does this “corner” represent? What stage(s) correspond to the downward sloping line?

Meiosis II is similar to mitosis in that

  1. sister chromatids separate during anaphase
  2. DNA replicates before the division.
  3. the daughter cells are diploid.
  4. homologous chromosomes synapse

The diploid number for fruit flies is 8, and the diploid number for grasshoppers is 46. If no crossing over took place, would the genetic variation among offspring from a given pair of parents be greater in fruit flies or grasshoppers? Explain.

Many species can reproduce either asexually or sexually. Explain what you think might be the evolutionary significance of the switch from asexual to sexual reproduction that occurs in some organisms when the environment becomes unfavorable.
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