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During crossing over in meiosis, which structures exchange DNA?
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12. Meiosis
Genetic Variation During Meiosis
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How does meiosis contribute to genetic variation in offspring?
A
By duplicating the entire genome
B
By allowing crossing over between homologous chromosomes
C
By producing identical daughter cells
D
By preventing mutations during cell division
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Understand the process of meiosis: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four genetically distinct daughter cells. It is essential for sexual reproduction and contributes to genetic diversity.
Learn about homologous chromosomes: During meiosis, homologous chromosomes (pairs of chromosomes containing the same genes but possibly different alleles) align closely together in a process called synapsis.
Explore crossing over: Crossing over occurs during prophase I of meiosis when homologous chromosomes exchange segments of genetic material. This recombination results in new combinations of alleles, contributing to genetic variation.
Consider the role of independent assortment: During metaphase I, homologous chromosomes are randomly distributed to daughter cells, further increasing genetic variation. This process is known as independent assortment.
Recognize the importance of genetic variation: The genetic variation produced by meiosis is crucial for evolution and adaptation, as it increases the likelihood of offspring having advantageous traits.
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