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Sholpan [36]
3 years ago
13

ANSWER AND I WILL GIVE BRAINLIEST AND POINTS!

Biology
1 answer:
ehidna [41]3 years ago
8 0

Answer:

A DNA marker

Explanation:

also known as a size standard or a DNA ladder) is loaded into the first well of the gel. The fragments in the marker are of a known length so can be used to help approximate the size of the fragments in the samples.

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Natural selection that changes the distribution of a trait to favor one extreme phenotype is called.
jarptica [38.1K]

Answer:

<h2><u>directional selection</u></h2>

Explanation:

This type of natural selection is referred to as . In this type of natural selection, either one phenotype is preferred or the other; therefore, there is no equilibrium between the populations of the phenotypes that are present.

Examples of organisms that have undergone directional selection are black bears during the ice ages, African chichlid and sockey salmon.

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The backbone of a nucleic acid molecule is made of
Sindrei [870]

Answer:

sugar-phosphate forms the structural framework of nucleic acids, including DNA and RNA

Explanation:

A sugar-phosphate backbone joins together nucleotides in a DNA sequence. The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

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Water, Carbon Dioxide, and Sunlight

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After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.

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because it is also created from the father not only one of them

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