Answer:
A. decrease by half.
B. stay the same.
C. double.
Explanation:
Host-pathogen models resembels the host-parasite models and predator-prey which is used to evaluate the evolutionary strategies of pathogens.
The host-vector-pathogen system can be demonstarted as a change in the number of 4 types of people: healthy hosts, uninfected vectors, infected hosts, and infected vectors.
The threshold density should decrease by half, stay the same, or double, according to the standard host-pathogen model, if the combined death and recovery rate from a disease doubles, and the ability of the disease to spread from infected to uninfected persons.
Hence, the correct options are A. decrease by half, B. stay the same, and C. double.
Answer:
Addition of a(n) methyl group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally silent; addition of a(n) acetyl group to certain lysine residues makes the region of chromatin transcriptionally active.
Explanation:
The changes suffered in the expression and activity of the genes are studied by the Epigenetics.
Nasal conchae is the <span>structure of the respiratory system that moistens and filters inhaled air.</span>
The difference between weather and climate is that weather consists of the short-term (minutes to months) changes in the atmosphere. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric<span> pressure, as in high and low pressure</span>
<span> The first designer baby was created in the U.S. in 2000. Doctors used screening techniques to test the embryos of Lisa and Jack Nash. They chose the embryos that would be an exact cell match to their daughter Molly. Molly suffers from a genetic disorder called Fanconi Anemia which causes bone marrow deficiency. The embryo selected did not carry the disease and was a perfect tissue match. <span>As a result, Adam Nash was born in August after Mrs. Nash underwent four IVF cycles. Stem cells were collected from his umbilical cord to be donated and used to replace Molly's bone marrow. (Baby created to save older sister)Since the creation of Adam, many more couples have created their own designer baby to save their sick child or prevent their offspring from inheriting a certain genetic disease. </span></span>
