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Bezzdna [24]
3 years ago
14

Which is the best definition for directional selection

Biology
2 answers:
kotegsom [21]3 years ago
6 0
It is a mode of natural selection where an extreme phenotype is favored by the other phenotypes  causing the allele frequency to  shift over time in the direction of that phenotype
postnew [5]3 years ago
3 0

Answer:B- a process by which one of the extreme variations of a trait is favored.

Explanation:

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After first exposure to an antigen, about how long does it take for antibodies to reach a detectable level?
Salsk061 [2.6K]

After first exposure to an antigen, it can take about three weeks for antibodies to reach a detectable level. The body will react to disease by creating antibodies and testing their effectiveness against the unknown antigen.

Antibodies are the body's way of fighting off foreign threats. Also known as immunoglobulin, they detect and attack pathogenic bacteria and viruses. These antibodies detect a protein that is unique to the surface of the pathogen called the antigen.

At times, we can see an increase in antibodies for one disease, for example, <em>Lyme disease</em>, in the presence of <em><u>non-Lyme disease antigens.</u></em> This is often due to antigenic variation, which is a method used by pathogens to mask their respective antigens. There are also general use antibodies that will increase in reaction to any pathogen.

As with any illness, a patient who receives treatment sooner will fare better than those whose treatment is delayed. This is due to the fact that earlier treatment with antibiotics will allow the body to fight off the infection before the bacteria can reproduce further.

After the first immune response, antigen-specific antibodies will remain for some time to provide the body with "immunity" to the pathogen, while <u>general-purpose antibodies will return to a base value. </u>

To learn more visit:

brainly.com/question/7597406?referrer=searchResults

6 0
2 years ago
Read 2 more answers
Match each animal with the correct classification.
miv72 [106K]

Answer:

eagle- chordata phylum

ladybud- Insecta class

scorpian- Arachnida class

lobster- Crustacea class

snail- Mollusca phylum

Explanation:

The organism that contains a notochord at some of its life cycle stage are called chordates and all vertebrates are chordates so eagle comes under phylum Chordata.

Insecta is the largest class of phylum Arthropoda which contains organisms which have jointed legs, exoskeleton and segmented body for example ladybird, playing mantis, etc.

Arachnids are animals which have jointed legs and in this class spider are the largest order which contains scorpions, mites, ticks, etc.

Crustaceans are invertebrates which have hard shell made up of calcium for example lobster, prawn, shrimp, etc.

Mollusks are very large invertebrate phylum which contains a soft segmented body that is usually present inside a shell made up of calcium. for example snails.

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4 years ago
If a cell has a high concentration of waste that it wants to get rid of, which do you predict will be able to get rid of the was
valina [46]

Answer: smaller cell

Explanation:

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3 years ago
Whitch part of the cells help keep all its pieces together
timama [110]

Answer:

Cytoplasm

Explanation:

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3 years ago
What type of boundary is depicted in the image below?
Svetach [21]

Answer:

A

Explanation:

because i did this and i got it right

5 0
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