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.
Horizontal gene transfer probably started soon after endosymbiosis. It has resulted in genes being moved from the mitochondrion to the nucleus.
What is a reasonable explanation for why some genes still remain in the mitochondria?
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A.
The products of those genes are rapidly damaged and need to be quickly replaced.
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B.
The products of those genes are not required for organelle function.
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C.
The ability for lateral gene transfer ended about a billion years ago and some genes simply got “stuck” within mitochondria.
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D.
The products of those genes are only needed in the mitochondria.
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