Your friend has a blood type of B, but he doesn’t know what his Rh factor is. One of his parents is B-, and one is O+. Can you know for sure what his Rh factor is? Why or why not?

Blood Types

Blood transfusions are a lifesaving treatment for many Americans. Blood transfusions are needed for many reasons, including surgery, after accidents, and for patients with chronic illnesses and cancer.

Blood cannot be artificially made, so doctors rely on volunteer donations. To keep the blood supply safe, every donation is tested for blood type and checked for infectious diseases.

O negative. This blood type doesn't have A or B markers, and it doesn't have Rh factor.

O positive. This blood type doesn't have A or B markers, but it does have Rh factor. O positive blood is one of the two most common blood types (the other being A positive).

A negative. This blood type has A marker only.

A positive. This blood type has A marker and Rh factor, but not B marker. Along with O positive, it's one of the two most common blood types.

B negative. This blood type has B marker only.

B positive. This blood type has B marker and Rh factor, but not A marker.

AB negative. This blood type has A and B markers, but not Rh factor.

AB positive. This blood type has all three types of markers — A, B, and Rh factor.

(sorry if im wrong)

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what subject is this

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion