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hammer [34]
3 years ago
9

John and Pat are identical twins with identical DNA. John works in a movie theater, and Pat works as a lifeguard. They have very

different skin pigmentation. Which is the best explanation of the difference?
Biology
2 answers:
Elan Coil [88]3 years ago
7 0

The answer is:

A) Skin color, a polygenic trait, is also determined by environmental factors.


Hope it helps!

skelet666 [1.2K]3 years ago
5 0
The best explanation of the difference is <span>Skin color, a polygenic trait, is also determined by environmental factors.
Environmental factors can greatly impact somebody's skin and its pigmentation. In this case, the presence of sunlight is the environmental factor - one of the boys works in a movie theater, with little to no exposure to the Sun, whereas the other one spends most of his days in sunlight, which is why his skin color is different from his brother's. 
</span>
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Scientific research about the carbon cycle and global warming would be most valuable if the results
GarryVolchara [31]

Answer:

if the results are efficient in answering the problems raised in the research and if they manage to come to terms with the hypotheses.

Explanation:

As you may know, scientific research must be done through several steps that allow an experiment to be carried out in order to reach conclusions on a certain topic.

In research on the carbon cycle and global warming, it is necessary for the researcher to raise problems and questions about this topic, as well as to raise hypotheses that must be directly related to the results of the experiment. If the result of the experiment is efficient in answering the research problems and questions, in addition to being able to agree with the presented hypotheses, it means that the research has value within the scientific branch in which it fits, in addition to showing that the experiment was done correctly.

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3 years ago
Weathering is a _____ force since it naturally breaks rock down into sediment.
svetlana [45]

Answer: C

Explanation:

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3 years ago
Descibe how the muscle contracts and recharges starting with the release of Ca+ and ending with the cycle of recharging
Paul [167]

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3 years ago
Please give a small paragraph quickly summarizing the what, when and how of each of the following techniques: PCR, DNA gel elect
Anuta_ua [19.1K]

Answer:

All are used to resolve questions in molecular and biochemistry/biotechnology

Explanation:

PCR: resolution of an amplicong on agarose gel to chech size after thermocycling

DNA gel electrophoresis,

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Northern blots, Method used to detect different sizes RNA from a mixture of other products

Southern blots, method used to detect different sizes of DNA similar to the idea of a Northern Blot

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ELISA, enzyme-linked immunosorbent assay is used to check the presence of a protein

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Chromatography, separation of chemical thru a media by colors

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Confocal microscopy,

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GFP, Green fluorescent protein, a reporter protein used in recombination protein creation

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Phase contrast microscopy, Microscopy technique used to detect the different states of matter of a specimen

Fluorescence microscopy, use of fluorophore attached to sample for investigation

Transmission electron microscopy, uses beams of electrons to pass through a sample to then create an image

Scanning electron microscopy,  the surface of a sample is scanned with a beam of electrons to generate an image

X ray crystallography, determining a structure of a protein my using an x-ray technique

2D PAGE electrophoresis,  separation of proteins by two phases sizes and charges

NMR,  Nuclear magnetic resonance, spinning of all the nuclei and measurement of the energy that it gives off.

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Helga [31]
I think the answer is b
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