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gulaghasi [49]
2 years ago
13

Scientists discovered that the difference between blond and dark hair comes down in part to a single nucleotide difference in th

e DNA sequence of an enhancer that lies more than 350,000 base pairs away from the gene it controls. On average, blonds transcribe this gene less efficiently than people with dark hair. How can a tiny difference in a distant enhancer make a blond?
Biology
1 answer:
AleksandrR [38]2 years ago
7 0

Answer:

The answer is given below.

Explanation:

A tiny difference in a distant enhancer make a blond through DNA Looping.

DNA Looping can bring the enhancer bound by an activator physically closer to the promoter even if the enhancer is located far away along the DNA molecule.

DNA Looping.

When a protein or a set of complex proteins binds to 2 different sites of DNA simultaneously while looping out the interfering DNA.  

Important of DNA Looping

  • It regulates metabolism of DNA
  • it is involved in transcriptional initiation of prokaryotic operons.

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A cell is in a equilibrium with its surrounding at 30 degrees Celsius. The molarity of surrounding sucrose solution is 0.5m. Cal
Travka [436]

Solute potential of a solution is calculated using the formula,

Ψ_{s}=-(iCRT)

Where,

Ψ_{s}is the solute potential of the solution,

<em>i</em> is the degree to which the solute ionizes(ionization constant) in solution = 1, as sucrose is a nonelectrolyte.

C is the concentration of the solution in molarity = 0.5 M

R is the gas constant or the pressure constant = 0.0831 L.bar/(mol.K)

T is the temperature in Kelvin scale = 30^{0}+273 =303 K

Calculating the solute potential of the surrounding sucrose solution:

Ψ_{s}=-(iCRT)

              = -(1 * 0.5 M * (0.0831 L.bar/(mol.K))* 303 K)

              = 12.6 bar

Therefore, the solute potential of the surrounding solution is 12.6 bar

7 0
2 years ago
How is a warm front different from a cold front?
Anarel [89]
Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface.
6 0
1 year ago
Read 2 more answers
5. Michael wanted to see what kitchen cleaner worked best for cleaning her counters. He used
zimovet [89]
Yeah it haves to be C if not then it could be b I think but I probably more positive with c
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2 years ago
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In the fall of the year, the leaves of some trees change color as chlorophyll begins to break down. What impact does this have o
Rzqust [24]

Answer:

There is no short answer.

Explanation:

The chlorophyll is the pigment that gives the plants' leaves their green colors and it is also responsible for the photosynthesis process which takes place in the mitochondria. In the fall as the leaves change color, the amount of chlorophyll decreases and this impacts the mitochondria as it also decreases the amount of work the mitochondria does.

I hope this answer helps.

4 0
2 years ago
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A situation in which the coefficient of coincidence is greater than 1.0 would indicate that: A. no double crossovers were found
damaskus [11]

Answer:

B. there were more double crossovers in the progeny than would be expected based on probability

Explanation:

Crossing over or recombination can be defined as the exchange of genetic material between homologous chromosomes during meiosis. Moreover, the coefficient of coincidence is the number of double recombinants found in the progeny. The coefficient of coincidence can be estimated by the following equation:  

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where ADRF = Actual Double Recombinant Frequency

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In the case above described, ADFR is higher than EDRF, and therefore COC will be higher than 1.

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