Which of these is an example of behavioral isolation?

a.) the frog species rana aurora breeds in fast–moving streams, whereas its relative rana catesbiana breeds in still ponds.

b.) two species of pines, pinus radiata and pinus muricata, grow together in california, but pinus radiata sheds its pollen in early february and pinus muricata in april.

c.) two species of crickets, gryllus rubens and gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species.

“Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species” is an example of behavioral isolation.

Behavioral isolation is an important evolutionary mechanism that helps members of the same species identify each other as proper mates.

The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

C.) Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species.

Explanation:

The behavioural isolation can be define as the reproductive isolation which occurs when the two related species of the same species exhibit different mating rituals and signals which prevents them to breed with the two distinct populations.

C. is the correct option this is because of the fact that these two species utilize different courtship songs which can be used to attract the mates of opposite sex. This is likely to bring behavioral isolation between the two species of crickets.

the calvin cycle has three stages. in stage 1, the enzyme rubisco incorporates carbon dioxide into an organic molecule. in stage 2, the organic molecule is reduced. in stage 3, rubp, the molecule that starts the cycle, is regenerated so that the cycle can continue

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.