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Blood Group

Blood groups ...

Question

Blood groups are called as positive due to the presence of Rh (Rhesus) factor on the blood cells.

A

False

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B

True

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Solution

The correct option is B
True

Rhesus (Rh) factor is a protein found on the surface of RBC. If the blood has Rh protein then the blood is said to be positive. For example, A+, B+, AB+ ,O+. If the Rh factor is not present, then the blood group is called, negative blood group. The first basic blood test for finding the antigen was performed on the rhesus monkey, hence the name was given as Rhesus factor.

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If this town's high school has 2,000 students, how many would you expect to be heterozygous for the D antigen?

Q. One way to classify humans is by their blood type. There are over two dozen ways to group blood types. One of them is by the presence of the D antigen on the surface of blood cells. If an individual expresses the D antigen, they are referred to as Rh positive. This is controlled by an autosomal dominant allele. In a given town, 16% of the population is considered Rh negative.
If this town's high school has 2,000 students, how many would you expect to have the homozygous recessive genotype?

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