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Questions and Answers
What does homologous pairs refer to?
What does homologous pairs refer to?
- Chromosomes that code for the same thing (correct)
- Chromosomes with no information
- Chromosomes that code for different traits
- Chromosomes that are not similar
What is crossing over?
What is crossing over?
Sister chromatids intertwine.
What is genetic variation?
What is genetic variation?
New combination of traits.
What is a tetrad?
What is a tetrad?
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What are chiasmata/synapsis?
What are chiasmata/synapsis?
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Crossing over occurs during ______ 1.
Crossing over occurs during ______ 1.
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What is the function of the centromere?
What is the function of the centromere?
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Study Notes
Genetic Terminology in Crossing Over
- Homologous pairs refer to chromosomes that carry the same genes, indicating they hold "same information."
- Crossing over is the process where sister chromatids intertwine, allowing genetic material to be exchanged.
- Genetic variation results from new combinations of traits formed during reproductive processes, contributing to increased genetic diversity and driving evolution.
Structural Components
- A tetrad consists of two homologous chromosomes paired together, enabling genetic exchange during meiosis.
- Chiasmata (or synapsis) are specific locations on the chromosomes where crossing over occurs, pivotal for genetic recombination.
Process of Crossing Over
- The phenomenon of crossing over takes place during prophase 1 of meiosis.
- During this stage, homologous pairs swap segments of their chromosomes, a critical factor in promoting genetic variation.
Key Chromosomal Structure
- The centromere is the central region that holds sister chromatids together, essential for proper segregation during cell division.
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