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ExtremeBDS [4]
3 years ago
13

A. Measles generates a weak immune response that allows reinfection of hosts, and therefore does not easily evolve escape varian

ts.
b. Human influenza a virus evolves escape variants, resulting in a distinctive cactus-shaped phylogeny.
c. Measles experiences strong selection for escape variants, resulting in a phylogeny similar to a nonpathogenic species.
d. Human influenza a generates lifelong immunity, so there is no selection for escape variants.
Biology
1 answer:
Doss [256]3 years ago
3 0

The correct answers are:

b. Human influenza a virus evolves escape variants, resulting in a distinctive cactus-shaped phylogeny.  

All types of Human influenza viruses evolve to escape immunity induced by prior infections and vaccinations.

c. Measles experiences strong selection for escape variants, resulting in a phylogeny similar to a nonpathogenic species.  

As a result of measles infection, specific antibody and CD4 and CD8 T cell responses are generated and contribute to virus clearance and protection from reinfection.

 


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Nataly_w [17]

Answer:

The correct answer is "Red shift"

Explanation:

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Red shift: When the source and observer move away from one another, the clear frequency diminishes or apparent wavelength increments. Here the Doppler shift is negative. This is known as red shift.

8 0
3 years ago
or each of the following genetic topics, indicate whether it focuses on transmission genetics, molecular genetics, genomics or p
Bad White [126]

Answer:

A. transmission genetics

B. population genetics

C. molecular genetics

D. genomics

E. molecular genetics

Explanation:

Transmission genetics can be defined as the study of the mechanisms involved in the inheritance of genetic material by offspring from parents. This discipline started with the discovery of inherited characteristics in pea plants by Mendel (1865).

Population genetics is a subdiscipline of genetics that studies genetic variation within and between populations. Population genetics is an area that explains how allele and genotypic frequencies change across time, thereby this subdiscipline is closely linked to evolutionary biology.

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Molecular genetics is a sub-discipline of genetics that studies the mechanisms involved in preserving the genetic material (i.e., DNA and RNA), and to understand how the structure and expression of the genetic material influence the observed variation among organisms.

6 0
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When the skin is exposed to ultraviolet radiation, it responds by?
OLga [1]
Increasing melanin production. 



Good luck! (:

~ Jasmine
4 0
4 years ago
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Rufina [12.5K]

Answer:

sedimentary

Explanation:

a sedimentary rock is a layered rock that is formed from compaction, cementation, and recrystallization of sediments. :)

7 0
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Mekhanik [1.2K]

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