18) The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when the hybrids mate with other hybrids or with adults of either species, they are rarely successful in producing offspring. What can you infer from this information? A) Postzygotic isolation exists between the two frog species. B) Prezygotic isolation exists between the two frog species. C) These two species are likely in the process of fusing back into one species. D) The hybrids form a separate species under the biological species concept.
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.
![18) The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana
ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across
central Europe to Russia. Both male and female hybrids exist, but when the hybrids mate with other
hybrids or with adults of either species, they are rarely successful in producing offspring. What can you
infer from this information?
A) Postzygotic isolation exists between the two frog species.
B) Prezygotic isolation exists between the two frog species.
C) These two species are likely in the process of fusing back into one species.
D) The hybrids form a separate species under the biological species concept.
19) There is an island in the middle of a large river that houses a large population of ants. Damming of
the river causes the island to flood and only the highest points of the island are now above water. The
ants cannot swim, so are now in multiple isolated populations. Which of the following best describes
this event?
A) This situation represents isolation by dispersal.
B) This situation represents isolation by vicariance.
C) This situation represents a form of sympatric speciation.
D) Only a rare development of polyploidy could lead to speciation in this case.
E) Speciation will not occur in this case because of gene flow.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2be0588c-31cb-4200-8b36-2995897a0279%2Fc15d2d59-aa87-4062-9534-448fa588fdc5%2Fd4tx365_processed.png&w=3840&q=75)
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