During meiotic prophase in a eukaryotic cell, Spo11 initiates recombination by causing a double-strand break in DNA between Gene A and Gene B on one sister chromatid. Which of these events will occur prior to formation of a Holliday junction? A) A heteroduplex forms due to pairing of Gene A and Gene B. B) Resolvase cuts all four chromatids. C) Spo11 causes a double-strand break in a nonsister chromatid. D) Strand invasion causes one strand of the uncut chromatid to form a D loop. E) Branch migration lengthens the heteroduplex region to include Gene A and Gene
Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
During meiotic prophase in a eukaryotic cell, Spo11 initiates recombination by causing a double-strand break in DNA between Gene A and Gene B on one sister chromatid. Which of these events will occur prior to formation of a Holliday junction?
A) A heteroduplex forms due to pairing of Gene A and Gene B.
B) Resolvase cuts all four chromatids.
C) Spo11 causes a double-strand break in a nonsister chromatid.
D) Strand invasion causes one strand of the uncut chromatid to form a D loop.
E) Branch migration lengthens the heteroduplex region to include Gene A and Gene
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