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slamgirl [31]
2 years ago
7

Imagine a population of Galápagos finches that vary for bill size. If the population mean is near the optimum size for eating th

e seeds found on the island, what would we expect to occur if their main seed resource goes extinct, and another plant with much larger seeds replaces it?
Biology
1 answer:
harina [27]2 years ago
4 0

The question is incomplete. The complete question is:

Question: Imagine a population of Galápagos finches that vary for bill size. If the population mean is near the optimum size for eating the seeds found on the island, what would we expect to occur if their main seed resource goes extinct, and another plant with much larger seeds replaces it?

a) Stabilizing selection maintaining the population average .

b) Directional selection increasing bill size towards a new optimum .

c) Extinction of the new plant as finches each all its seeds .

d) Disruptive selection increasing phenotypic variance for bill size .

e) Correlational selection between seed size and bill size.

Answer:

b) Directional selection increasing bill size towards a new optimum .

Explanation:

Directional selection occurs when there is a change in the environmental conditions and includes gradual replacement of one phenotype with another. The changes in the environmental conditions favor one of the extreme phenotypes.

According to the given information, there is a change in the seed size available as food for the finches. The extinction of the main seed and availability of larger seeds would favor the bill size that allows the finches to feed on the larger seeds. Directional selection would favor this beneficial bill size and gradually, the bill size of the population would change in favor of the new optimum bill size.

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3 years ago
Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"? Sel
Mila [183]

Answer:

Cyclic AMP and calcium may be second messengers.

Explanation:

these are signalling molecules that are located inside the cells,They are releases  when cells   are in contact with  signals from an extracellular molecule. the extracellular molecules that cause the chemical  reaction  in an external environment  in the second messenger are called first messenger.

<u>the basic mechanisms of second messenger involve the binding of ligands to the cell membrane receptors( usually a trans membrane protein).causing   conformational  change in the receptor protein. The latter change affect the structural and functional activities of the receptors protein with a consequent  production of second messenger,</u>

<u />

Response of the cells  to the first messenger my cause different form of cellular reactions; the cells may  undergo depolarization  with influx of out flux of ions, differentiate to specialized cells  or migrate to another location.

Examples of first messenger are hormones and neurotransmitters, while calcium ions, cyclic GMP,AMP, diaclyglycerol are examples of first messengers.

Most first messengers are peptide hormones.Some may be streroid, However, the hydrophilic nature of the peptide hormone restrict their movement, at the cell membranes. Therefore most first messengers made of  peptide  are first converted to second messenger to  bring about their signalling effects.The usually mark the beginning of cascade events by second messengers.

Second messengers are usually classified based on their polarity and molecular form this include the

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3 years ago
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2 years ago
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Human monoclonal antibody (mAbs) are emerging in the field of cancer therapy and have become an increasing proportion of new drugs that are recently approved. Although there are some methods to obtain antigen-specific mAbs from human B cells, it is generally impossible to directly immunize human beings with antigens of interest. For example, for infectious agents, those approaches are largely restricted. To solve these obstacles, two main approaches have been developed; either by humanizing antigen-specific antibodies from small experimental animals (which is laborious due to the great genetic differences from humans) or rely on the in vitro selection of antigen-specific binders from human antibody repertoires. However, the human mAbs developed by these methods are usually with low affinity.

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Resource: http://www.creative-biolabs.com/High-Affi-TM-Human-Antibody-Discovery.html

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Answer:

A

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