Multiple Choice
Sister chromatids present at metaphase II might not be genetically identical to each other because:
2
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4. Genetic Mapping and Linkage
Crossing Over and Recombinants
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In prophase I of meiosis, allele shuffling between homologous chromosomes occurs in a process called:
A
nondisjunction
B
crossing over
C
independent assortment
D
replication
Verified step by step guidance1
Understand the context: The question asks about the process during prophase I of meiosis where alleles are shuffled between homologous chromosomes.
Recall the key events of prophase I in meiosis, which include pairing of homologous chromosomes and exchange of genetic material.
Identify the process where homologous chromosomes physically exchange segments of DNA, leading to new combinations of alleles. This process is called crossing over.
Differentiate crossing over from other options: nondisjunction is an error in chromosome separation, independent assortment refers to the random distribution of chromosomes during metaphase I, and replication occurs before meiosis begins.
Conclude that the correct term for allele shuffling during prophase I is crossing over.
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