Red-green color blindness is an X-linked recessive disorder. A Punnett square is shown. The columns are labeled X Upper B and Upper Y. The rows are labeled x Upper B and x b.

What is the probability of having red-green color blindness for the cross that is represented by the Punnett square?

0 percent

25 percent

50 percent

75 percent

50 percent

Explanation:

By creating a punnet square it would result in XXBB, XBY, XxBb, and xBY. Because red-green color blindness is recessive there must be two x. There are two out of the four combinations that have 2 x.

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."