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Meiosis: Crossing Over and Synapsis

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Questions and Answers

During prophase I, what holds the homologs together tightly?

Centromere

Cohesins

Synaptonemal complex (correct)

Chiasmata

What is the result of crossing over during prophase I?

Cells with an increased number of chromosomes

Cells that differ genetically from each other and from the parent cell (correct)

Cells with a reduced number of chromosomes

Genetically identical cells

During which stage of meiosis do homologous pairs line up at the metaphase plate?

Telophase I

Metaphase II

Anaphase I

Metaphase I (correct)

What is the purpose of cohesins during meiosis?

To hold sister chromatids together Signup and view all the answers

What is unique to meiosis I?

Synapsis and crossing over in prophase I Signup and view all the answers

What is the end result of meiosis?

Four cells that differ genetically from each other and from the parent cell Signup and view all the answers

What is the number of combinations possible when chromosomes assort independently into gametes?

2n, where n is the haploid number Signup and view all the answers

During which stage of meiosis do chromosomes line up at the metaphase plate?

Metaphase II Signup and view all the answers

What is the result of crossing over during meiosis?

Recombinant chromosomes that combine DNA from two parents Signup and view all the answers

During which stage of meiosis do sister chromatids separate?

Anaphase II Signup and view all the answers

What is the process by which homologous chromosomes pair up during meiosis?

Synapsis Signup and view all the answers

On average, how many crossover events occur per chromosome during meiosis?

One to three crossover events Signup and view all the answers

What occurs during synapsis?

Nonsister chromatids are held together Signup and view all the answers

What is the result of crossing over during prophase I?

Genetic variation increases Signup and view all the answers

What occurs during anaphase I?

Homologous pairs move to opposite poles Signup and view all the answers

What is the result of random fertilization?

Each zygote has a unique genetic identity Signup and view all the answers

What occurs during prophase I that increases genetic variation?

Synapsis and crossing over Signup and view all the answers

What is the approximate number of diploid combinations possible from independent assortment during meiosis?

70 trillion Signup and view all the answers

Meiosis: Crossing Over and Synapsis

Choose a study mode

Podcast

Questions and Answers

During prophase I, what holds the homologs together tightly?

What is the result of crossing over during prophase I?

During which stage of meiosis do homologous pairs line up at the metaphase plate?

What is the purpose of cohesins during meiosis?

What is unique to meiosis I?

What is the end result of meiosis?

What is the number of combinations possible when chromosomes assort independently into gametes?

During which stage of meiosis do chromosomes line up at the metaphase plate?

What is the result of crossing over during meiosis?

During which stage of meiosis do sister chromatids separate?

What is the process by which homologous chromosomes pair up during meiosis?

On average, how many crossover events occur per chromosome during meiosis?

What occurs during synapsis?

What is the result of crossing over during prophase I?

What occurs during anaphase I?

What is the result of random fertilization?

What occurs during prophase I that increases genetic variation?

What is the approximate number of diploid combinations possible from independent assortment during meiosis?

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