One characteristic of the immune response is specificity. This means that immunity is directed against a particular pathogen
Explanation:
The ability of the body to protect itself from the attack of pathogen or antigen and maintain this state of protection is called immunity.
Immunity has been broadly classified as -Innate immunity and adaptive immunity.
Innate immunity is present since birth and is not antigen specific.
Adaptive immunity is developed during the life time and it is highly antigen specific.
The correct answer is an F1 generation.
The parent plants in the experiments conducted by Mendel are considered as the P (for parent) generation. The F1 stands for the first filial generation, which was obtained on cross-pollinating the parent plants. The F2 stands for the second generation, which is attained after self-pollinating the F1 generation plants.