A cactus can either have long needles (L) or short needles (). A cactus grower crosses two cacti. The cross is shown in the Punnett square below.
What is the phenotype ratio for this cross?
A. Four long, zero short
B. One long, three short
C. Two long, two short
D. Three long, one short

D.

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OPTION D will right

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

currents is the correct answer.