Edward jenner discovered vaccinations. he found that some of the dairymaids who worked with cows had suffered lesions on their hands, and that these dairymaids were immune to the more severe smallpox. then, he inoculated james phipps with material from the lesions on a dairymaids’ hands. which best explains why jenner decided to infect phipps?
a. the material contained antibodies that could destroy the smallpox pathogen.
b. the material contained pathogens that were similar to but weaker than the smallpox pathogen.
c. the material had oxygen that could the cells of the body fight off smallpox infection.
d. the material contained a pathogen that could attack the smallpox pathogen.

(B).The material contained pathogens that were similar to but weaker than the smallpox pathogen.

Explanation:

Edward Jenner was a English scientist, who first developed first vaccine of the world. Vaccines contain a killed or weaker forms of pathogens. When injected into host body, they induce immune response and production of memory cells, but cannot cause disease. These memory cells later protect the body from subsequent infections from the wild type strain of that pathogen

Jenner decided to infect Phipps with inoculation from the lesions on hands of a dairymaid because those lesions contained a weaker form of pox viruses that could trigger immune responses in host, but were unable to cause disease.

Thus, the correct answer is option (B).

(B).The material contained pathogens that were similar to but weaker than the smallpox pathogen.

Explanation:

Edward Jenner was a English scientist, who first developed first vaccine of the world. Vaccines contain a killed or weaker forms of pathogens. When injected into host body, they induce immune response and production of memory cells, but cannot cause disease. These memory cells later protect the body from subsequent infections from the wild type strain of that pathogen

Jenner decided to infect Phipps with inoculation from the lesions on hands of a dairymaid because those lesions contained a weaker form of pox viruses that could trigger immune responses in host, but were unable to cause disease.

Thus, the correct answer is option (B).

correct answer is "The material contained pathogens that were similar to but weaker than the smallpox pathogen." Or B

correct answer is "The material contained pathogens that were similar to but weaker than the smallpox pathogen." Or B

a. by using fur or clothes to trap heat energy near the body

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.