The numbers in the figure below represent the chromosome number found in the nucleus each of the dog cells shown. The arrows indicate processes that are occurring
over time (for example, a cell at A with 78 chromosomes is dividing to become cells
with 39 chromosomes; two cells with 39 chromosomes are fusing at B to become a
cell with 78). The processes that are occurring at A and B are
B
(78
(39
(78
78
39
O Ais meiosis and B is pollination
O Ais mitosis and B is meiosis
O Ais meiosis and B is mitosis
O Ais meiosis and B is fertilization

a community that experiences major changes undergoes progress

this would be a math

step 1: initiation

initiation is the beginning of transcription. it occurs 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.

step 2: elongation

elongation 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.

step 3: termination

termination 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.

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