You can't have a carrier with a dominant pedigree because other wise than individual or organism would be afflicted by the gene and render them incapable of being a carrier. A carrier is an individual/organism that has a normal phenotype (meaning it is not afflicted by said gene) but is carrying the gene that could cause disease or whatever the affect may be. In this case the gene would have to be homozygous recessive to be expressed. Hopefully this helps!
Answer: They do this to obtain the vital nitrogen that they need to grow.
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Answer:
viruses are at the borderline of living and non-living organinsms outside the body of living host they are non-active and they cannot grow without their host
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