AP Biology Meiosis and Mitosis

If a stem cell has 24 chromosomes, how many will it have at the end of meiosis?

• 24
• 12
• 6
• the number varies per species

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Which of the following best describes meiosis?

• It is carried out in all tissues theat require cell replacement
• It occurs only in cells in the reproductive structures of an organism
• It happens in all of the tissues except the brain and spinal cord
• It is the first stage of mitosis

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When an area of a chromatid is exchanged with the matching area on a chromatid of its homologous chromosome, _________________ occurs

• crossing over
• mutagenesis
• hybridization
• fertilization

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A haploid cell has 

• one-half of a set of chromosomes
• one set of chromosomes
• two sets of chromosomes
• four sets of chromosomes

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Crossing over is important because....

• It prevents mutations from entering the gametes. 
• It allows for even distribution of chromosomes in the gametes.
• It allows for more genetic diversity of gametes.
• It allows for genetic uniformity of gametes. 

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NGSS.HS-LS4-2

How many cells are created during Telophase II?

• 1
• 2
• 3
• 4

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During meiosis I, what happens? 

• Sister chromatids are split
• Homologous chromosomes are split
• Four cells are created
• None of the other choices are correct

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The two ways to increase genetic variation during meiosis are crossing over and _____

• Synapsis
• Tetrad
• Independent assortment
• Gameiosis

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When does crossing over occur?

• Interphase
• Prophase 1
• Prophase 2
• Metaphase 1

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Trisomy is a genetic disorder that ________

• has three sets of chromosomes
• has three copies of a particular chromosome
• that is curable
• none of the above

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