If a boy exhibits a sex-linked trait that is carried on the x chromosome, what must be true?
a. his mother exhibited that trait.
b. his father exhibited that trait.
c. his father’s mother carried an allele for that trait.
d. his mother carried at least one allele for that trait.

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."

the match duh

explanation: