Two pink-flowering plants are crossed. the offspring percentages are 25% red, 25% white and 50% pink. what would the parent's genotypes be?
a. both homozygous dominant
b. both homozygous recessive
c. both heterozygous
d. one homozygous dominant, one homozygous recessive

When red crosses with white flowers to give pink flowers, we are looking at incomplete dominance, i.e. the offspring is a blend (pink) of the parents' characteristics (red or white).

Since we're given in the question two pink flowers crossed to give 25% red, 25% whit and 50% pink, we would be thinking of a punnett square between RW and RW, to give

RR RW

RW WW

Since both parents are RW, that makes both parents heterozygous.

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.