Answer:
the vaccine causes the immune system to produce antibodies to the virus that causes the measles
Answer:
Although an individual gene may code for a specific physical trait, that gene can exist in different forms, or alleles. ... In other cases, each parent provides a different allele of a given gene, and the offspring is referred to as heterozygous ("hetero" meaning "different") for that allele.
E-cool is a bacterium that occurs naturally in the intestines of people and animals
