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kirill115 [55]
3 years ago
5

In humans, methylation of chromosomal DNA is a signal that often leads to

Biology
1 answer:
Ulleksa [173]3 years ago
7 0

Answer:

The correct answer will be option-formation of heterochromatin

Explanation:

Methylation of DNA is the epigenetic mechanism which controls the expression of a gene by adding a methyl group to the cytosine bases in eukaryotic DNA.

The methylation of DNA converts the cytosine residues to the  5-methylcytosine catalysed by DNA methyltransferase enzyme. This results in the silencing of the gene and transcription get switched off.

Studies have shown that DNA methylation is involved in the formation and maintenance of the heterochromatin structure which is the condensed form of the chromatin in which transcription is switched off.

Thus, the formation of heterochromatin is the correct answer.

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Read the following scenarios carefully and explain how natural selection will occur in each.
IrinaK [193]

Answer:

The correct answer is - Noctural worms have the advantage over diurnal due to the fact that the nocturnal worms are burrowing during the feeding time of birds.

Explanation:

Natural selection is the process in which organisms adapt according to environmental changes to increase their survival rate. Natural selection leads to natural changes in different organisms.

In this case, diurnal worms are forced by the natural selection here to adapt to the change if they want to survive. Here, natural selection works for the nocturnal and against the diurnal.

4 0
3 years ago
What is the purpose of the G1 and G2 phases?
wel

Answer:

Explanation:The G1 and G2 phases are times of growth and preparation for major changes. The synthesis phase is when the cell duplicates the DNA in its entire genome. The three phases of interphase also allow for checkpoints to ensure that things are working properly.

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3 years ago
Which is a tough and rigid layer that surrounds plant cells, as well as some algal and bacterial cells?
Lemur [1.5K]
I’m sorry if this is wrong but cell wall
7 0
3 years ago
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Distinguish between the contribution of genes and the environment to phenotypes
rusak2 [61]
<span>Gene experssion are influenced by enviroment. the best example is skin color in case of human for e.g if person with fair color or white complexion goes to africa or any part where sun exposure is more his or her color gets dark .the darking of skin is due to melanin production. see here person is same only difference is in enviromental condition due to which gene which are responsible for the production of melanin are produced.
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Someone help is due at 11:59 :(
Ronch [10]

Answer:

sorry cant help

Explanation:

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