Tall pea plants are dominant over short pea plants. can a short pea plant ever be produced from crossing two tall pea plants? a. no, only short pea plants can produce short pea plants because it is a recessive trait b. no, short pea plants are a different type of pea plant and could never be the offspring of tall pea plants. c. yes, two heterozygous tall plants could produce short pea plants. d. yes, two homozygous tall pea plants could produce short pea plants.

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.