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Please place the following aspects of meiosis in the order in which they occur during M-phase. Assume that the meiotic cell being described has an interkinesis stage. Number 1-7.

Segregation of sister chromatids toward opposite poles of the cell followed by cytokinesis.

Alignment of duplicated chromosomes in the center of the cell

Condensation of chromosomes in a haploid cell

Condensation of chromosomes in a diploid cell

Alignment of pairs of chromosomes along their lengths and formation of chiasmata

Alignment of paired chromosomes in the center of the cell

Segregation of paired chromosomes toward opposite poles of the cell followed by cytokinesis

bronzerat101

-Complete the following sentences: metaphase of mitosis, prophase II of meiosis, crossing over, anaphase I of meiosis, variable, random fertilization, identical, random orientation, metaphase I of meiosis, prophase I of meiosis, metaphase II of meiosis, reduction division

Two processes that occur during meiosis produce genetically ____________ cells.

In a process called ____________ , paired homologous chromosomes align randomly at the cell equator. This occurs during this stage of cell division: ____________ .

In a process called ____________ , genetic material is exchanged between homologous chromosomes. This occurs during this stage of cell division: ____________ .

-Complete the following paragraph to describe nondisjunction and the resulting effects on chromosome number.

words: euploidy, primary nondisjunction, nomal, nondisjunction, secondary nondisjunction, homologous chromosomes, abnormal, trisomy, monosomy, sister chromatids, aneuploid

1.During meiosis I, ____________ separate and move towards opposite ends of the poles.

2.During meiosis II, ____________ separate and move towards opposite ends of the poles.

3.During meiosis I, if both members of a homologous pair go into the same daughter cell, ____________ is said to occur and no normal gametes are produced.

4.During meiosis II, if the sister chromatids fail to separate and both daughter chromosomes go into the same gamete, ____________ is said to occur. Half the gametes are aneuploid while the other half are euploid.

5.If an egg that contains 24 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.

6.If an egg that contains 22 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.

Part A- Microtubules. Select all that apply.

1) They are filaments in mitotic and meiotic spindles

2) They are required for moving sister chromatids to opposite sides of the poles during anaphase II of meiosis and anaphase of mitosis.

3) They are required for moving homologs to opposite sides of the poles during anaphase I of meiosis.

4) They are important for maintaining homologous chromosome pairing and plays a role in recombination.

5) They catalyze the phosphorylation of specific proteins.

6) They are a layered structue located between paired homologs in prophase I of meiosis in many organisms.

Part B- Cyclin-dependent kinases. Select all that apply.

1) They are filaments in mitotic and meiotic spindles.

2) They are enzymes that control progression through cell cycle.

3) They are required for the segregation of chromosomes during anaphase of mitosis or meiosis.

4) They are important for homologous chromosome pairing and plays a role in recombination.

5) They catalyze the phosphorylation of specific proteins.

Part C- Kinetochores. Select all that apply.

1) They are enzymes that control progression through cell cycle.

2) They are important for maintaining homologous chromosome pairing and plays a role in recombination.

3) They are required for the segregation of chromosomes during anaphase of mitosis or meiosis.

4) They are complx structures attached to the centromeres of chromosomes that bind to spindle microtubules.

5) They catalyze the phosphorylation of specific proteins.

Part D- Synaptonemal complex. Select all that apply.

1) It is required for moving sister chromatids to opposite sides of the poles during anaphase II of meiosis and anaphase of mitosis.

2) It is a layered structure located between paired homologs in prophase I of meiosis in many organisms.

3) It is complex structures attached to the centromeres of chromosomes that bind to spindle microtubules.

4) It catalyzes the phospohorylation of specific proteins.

5) It is important for maintaining homologous chromosome pairing and plays a role in recombination.

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