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ASHA 777 [7]
1 year ago
6

Epigenetics may be defined as changes in the expression of a gene or set of genes by _______ and _______.

Biology
1 answer:
nataly862011 [7]1 year ago
5 0

Epigenetics is the study of how DNA methylation and alterations to chromosomal proteins affect a gene or group of genes express themselves. For changes in a gene's expression, both of these are need.

In a biological process called DNA methylation, methyl groups are added to the DNA molecule. A DNA segment's activity can be altered by methylation without the sequence changing. DNA methylation usually inhibits transcription of genes when it occurs in a gene promoter.

Epigenetics literally translates to "along with changes in genetic sequence." Any procedure that modifies gene activity without altering DNA sequence and results in modifications that can be passed on to daughter cells is now included in the term. Is called Epigenetics.

Learn more about Epigenetics here

brainly.com/question/2670031

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Explanation:

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4 0
3 years ago
Select the correct statement about the special fetal blood vessels.
maks197457 [2]

The question is incomplete. The complete question is:

Question: Select the correct statement about the special fetal blood vessels.

A The umbilical vein becomes the ligamentum teres.

B The distal parts of the umbilical arteries form the superior vesical arteries.

C The hepatic portal vein forms from the umbilical artery.

D The fossa ovalis becomes the f oramen ovale.

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C) The umbilical vein becomes the ligamentum teres.

Explanation:

After birth, many vascular changes occur in the newborn child as the pulmonary, renal and digestive systems start functioning. As the umbilical cord is tied off and severed, the blood does not flow through the umbilical arteries. The umbilical vein in the child collapses but remains as the ligamentum teres. Ligamentum teres is a round ligament and serves to attach the umbilicus to the liver. It is present in the free border of the falciform ligament of the liver.

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