Cystic fibrosis is a recessive disease … an individual must have 2 copies of the recessive allele “c” to have the disease. What are the chances that a Cc mother and a CC father can have a child with cystic fibrosis? [Hint: make a Punnett square to figure this out.] A. 100% B. 75% C. 25% D. They can’t have a child with cystic fibrosis

weathering is the answer.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

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.

b. to discover aspects of the natural world.

hopefully i .