The task involves labeling the phases of meiosis in a cell. Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the production of gametes (sperm or egg cells). The process of meiosis can be divided into two main stages:
Meiosis I and
Meiosis II, each with distinct phases.
Phases of Meiosis:
1.
Prophase I: Chromosomes condense, homologous chromosomes pair up (synapsis), and crossing-over occurs.
2.
Metaphase I: Homologous chromosomes align at the metaphase plate.
3.
Anaphase I: Homologous chromosomes separate and move to opposite poles.
4.
Telophase I: Nuclear envelopes may reform, and cytokinesis occurs, resulting in two haploid daughter cells.
5.
Prophase II: Similar to prophase in mitosis; chromosomes condense again.
6.
Metaphase II: Sister chromatids align at the metaphase plate.
7.
Anaphase II: Sister chromatids separate and move to opposite poles.
8.
Telophase II: Nuclear envelopes reform, and cytokinesis occurs, resulting in four haploid daughter cells.
Solution:
Let's analyze the images provided in the worksheet and match them to the appropriate phase of meiosis:
#### Image 1:
-
Description: Chromosomes are visible but not yet paired up. The nuclear envelope is still intact.
-
Phase:
Prophase I
#### Image 2:
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Description: Homologous chromosomes are paired up (synapsis), and chiasmata (crossing-over points) are visible.
-
Phase:
Prophase I (late prophase I)
#### Image 3:
-
Description: Homologous chromosomes are aligned at the metaphase plate.
-
Phase:
Metaphase I
#### Image 4:
-
Description: Homologous chromosomes are separating and moving toward opposite poles.
-
Phase:
Anaphase I
#### Image 5:
-
Description: Two nuclei are forming, and the chromosomes are decondensing. Cytokinesis is occurring.
-
Phase:
Telophase I
#### Image 6:
-
Description: Chromosomes are condensed, and the nuclear envelope has broken down. This is similar to prophase in mitosis.
-
Phase:
Prophase II
#### Image 7:
-
Description: Sister chromatids are aligned at the metaphase plate.
-
Phase:
Metaphase II
#### Image 8:
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Description: Sister chromatids are separating and moving toward opposite poles.
-
Phase:
Anaphase II
#### Image 9:
-
Description: Four haploid nuclei are forming, and the nuclear envelopes are reforming. Cytokinesis is occurring.
-
Phase:
Telophase II
Final Answer:
\[
\boxed{
\begin{array}{ll}
\text{Image 1} & \text{Prophase I} \\
\text{Image 2} & \text{Prophase I (late)} \\
\text{Image 3} & \text{Metaphase I} \\
\text{Image 4} & \text{Anaphase I} \\
\text{Image 5} & \text{Telophase I} \\
\text{Image 6} & \text{Prophase II} \\
\text{Image 7} & \text{Metaphase II} \\
\text{Image 8} & \text{Anaphase II} \\
\text{Image 9} & \text{Telophase II} \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of phases of meiosis worksheet key.
