Dolly the cloned sheep looks like a donor ewe because of the presence of a nucleus in the nucleus.

Dolly the cloned sheep looks like a nucleus ewe because the nucleus contains: genetic material.

The nucleus of an organism contains a complete set of genetic information about the inheritance of an organism.

Control of the genetic material of Dolly sheep.

Cloning technology belongs to modern biotechnology In the breeding process of cloned sheep Dolly, a ewe is provided with cell membrane and cytoplasm; Another ewe provides the nucleus; The third ewe provides the place for the development of the embryo (uterus) Although Dolly the lamb was born by the third ewe, she does not look like the third ewe at all, because Dolly the lamb's nucleus is not provided by the third sheep, but from the nucleus Ewe and the genetic information is mainly located in the nucleus Dolly the lamb bred is very similar to the nucleus ewe, indicating that the nucleus is the control center

Therefore, b

(1) As can be seen from the above figure, sheep A provides a nucleus of egg cells, sheep B provides a nucleus, transplants the nucleus into a nucleated egg cell, fuses it into a cell, continues to cultivate, develops into an early embryo, and then transplants the embryo into the uterus of sheep C, and the embryo develops in the womb until maturity, childbirth, and the production of Dolly the lamb, and Dolly the sheep has three mothers of ABC

2) The nucleus of the egg cell that develops into Dolly the lamb comes from sheep B, and the rest of the cell comes from sheep A, and the egg cell develops in the womb of sheep C Dolly the lamb born is almost exactly the same as sheep B

3) The nucleus is the control center of heredity, which contains genetic material and can transmit genetic information, so the life experience of Dolly the sheep shows that the genetic information is in the nucleus

4) The number of chromosomes in the somatic cell and the zygote of the same species is the same, that is, the number of chromosomes in the zygote is the same as the somatic cell, and the chromosomes in the germ cell are half of the somatic cells

Therefore, the answer is: (1) three;

2）b；a；c；b

3) nucleus;

4）n．

It should be a B egg cell, and it may be that the answer is wrong.

This is a fact, Dolly the sheep is made out in this way, and it doesn't feel very accurate! The nucleus of the fused cell is derived from the ...... of the d mammary cell

From the analysis, it can be seen that the nucleus is a genetic information base, and it is the control center of cell metabolism and heredity, which is of great significance to the heredity of organisms Therefore, in the process of cloning, who provides the nucleus, the cloned organism is like who Although the cloned sheep Dolly was born by the third sheep, it does not look like the third sheep at all, the reason is because the nucleus of the cloned sheep Dolly is not provided by the third sheep, but from the nucleus sheep And the genetic information is mainly located in the nucleus Therefore, Dolly looks like a nucleus sheep Therefore, the title is incorrect

So the answer is:

Therefore, in the process of cloning, who provides the nucleus, the cloned organism is like who Although Dolly the lamb was born by the third sheep, it does not look like the third sheep at all, because the nucleus of Dolly the lamb is not provided by the third sheep, but it comes from the nucleus of the nucleus and the genetic information is mainly located in the nucleus So Dolly looks like a nucleated sheep

Hence the answer: genetic material.