How many defective copies of a gene must someone inherit to express a disease caused by a dominant gene? How many defective copies of a gene must someone inherit to express a
recessive disorder? What is the expected phenotypic ratio of affected to unaffected individuals for
a dominant disorder?

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

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one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.