What kind of sheep is Sean the lamb?
The question is simple,
this is a ...
Sheep!
There are many Mao Mao sheep. When we were watching this TV, they went to shave in one episode.
Question 2: The little sheep is just born, but the big sheep is crowded. What should I do? Sheep are common breeding animals. Belongs to mammals, Artiodactyla, cattle and sheep subfamily. Full figure and thick hair. Short head. Males have huge spiral horns, females have no horns or only small horns. Coat color is white. Herbivorous ruminant livestock. Sheep wool is the main raw material of wool spinning industry, and meat (especially mutton) is delicious and nutritious. Leather flakes can also be used as industrial raw materials.
Now sheep are raised all over the world. Timid. Autumn and winter * * *. The gestation period of female animals is145-152 days. 65438+ 0-5 nests per nest. The service life is 10- 15 years.
Sheep are thirsty and can provide meat, fur and other products for human beings.
[Edit this paragraph] Appearance characteristics
Sheep have plump bodies, thick fur and short heads. Rams often have large spiral horns, while ewes have no horns or small horns. There is a lacrimal fossa on the skull, and the nasal bone is prominent. All four hooves have toe glands. Male sheep have no female sheep. The weight ranges from tens of kilograms to 100 kilograms. Its structure and habits are suitable for grazing because of its various characteristics; The tip of the mouth and thin and elastic lips are conducive to eating short grass and thick straw and branches; Strong digestion ability; Some types can accumulate fat around the tail, buttocks and internal organs for eating when the green feed is insufficient in winter and spring; Imitate, gregarious, and have the habit of following leaders (usually old sheep) in groups; When grazing, I like to feed in the high places, and I also like to sleep in the high places of the pasture at night. Because of the thermal insulation of the jacket, it can resist cold and heat; But it is easy to get sick soon after cutting, such as when it is cold or rainy. Generally speaking, I prefer dryness to wetness. Sexual cowardice, lack of self-defense, vulnerable to animals. The natural life is about 15 years.
[Edit this paragraph] Variety types
It is estimated that there are at least 500 sheep breeds. According to the tail type, it can be divided into four categories: ① thin short-tailed sheep. The tail is thin without obvious fat deposition, and the tail is above hock joint, such as * * * sheep and romanov sheep. ② slender-tailed sheep. The tail is thin and below the Fei Da Festival, such as Xinjiang fine-wool sheep and Lincoln sheep; ③ Big-tailed sheep. fat
Short-fat-tailed sheep, such as small-tailed Han sheep, Mongolian sheep and Karakul sheep. The tails are piled up into mats of different shapes and sizes, and the tails are above the hocks; A sheep with a long, fat tail below the hock joint, such as a big-tailed Han sheep. ④ Fat-rumped sheep. Fat accumulation in the buttocks is cushion-shaped, with few coccygeal vertebrae and short tail in a "W" shape, such as Kazak sheep and Giselle sheep.
Sheep can be divided into the following categories according to production purposes.
Fine-wool sheep are mainly used to produce wool, accounting for about 10% of sheep breeds in the world. The capillary degree of the whole quilt is less than 25 microns, the count is not less than 60, and the wool length is more than 7 cm, which is an excellent raw material for making worsted textiles. Because of the different breeding objectives and local natural conditions in different countries, it can be divided into three types: wool, wool meat and wool (see Merino sheep).
Semi-fine wool sheep mainly feed on meat, accounting for about 33% of the world's sheep breeds. The whole quilt has a capillary degree of 32-58 and a length of 6-35 cm, and can be used for manufacturing fine textiles, wool, coats, industrial tweed, carpets and the like. According to the length of hair, it can be divided into two categories: ① middle hair species. Wool fiber is short and thin, with a length of 6 ~ 15cm and a fineness of 46 ~ 58. Originated in the hilly areas of southern England, such as Qiu Nan sheep, Oxford sheep, Hampshire sheep, Suffolk sheep, Sherlopshire sheep and Dorset sheep; Cowley sheep and Bolvas sheep bred by crossing fine wool sheep with long wool sheep also belong to this category. ② Long-haired species. Wool fiber is long and thick, about 12 ~ 35cm in length and 32 ~ 50 in fineness. Lincoln sheep, Leicester sheep, Leicester sheep in border areas and Romney sheep native to Britain all belong to this group.
The wool fiber of coarse wool sheep is mixed with fine wool (fluff), coarse wool, type II wool and dead wool, which can only be used to weave carpets, so it is also called "carpet wool sheep". Widely distributed all over the world, accounting for about 48% of all sheep breeds. Mongolian sheep and * * * sheep in China, Scottish black-faced sheep in Britain, and many local breeds in Africa and Asia belong to it. There is a big or short fat tail or fat ass, and there is also a small tail. Can adapt to barren grasslands and harsh climatic conditions. Generally, meat has good performance, strong fattening ability and beautiful meat quality.
The fur produced by fur sheep has the characteristics of good hair spike, large skin, light skin board, beautiful finished product and firmness. Tan sheep in China is the best breed to produce fur in the world.
Lamb skin sheep are slaughtered and skinned within 1 ~ 2 days after birth. Fur has beautiful curls and patterns and is full of luster. It is famous for the lambskin produced by Karakul sheep. China's Hu sheep lambskin also enjoys a high reputation in the international market.
Dairy sheep are mainly used for milk production. For example, the East Free Sheep in Germany ... >>
Question 3: The answer in Chinese reading comprehension B b refers to proper nouns. Others are not.
B exchanging nuclear eggs with electric pulses of the same frequency only makes the cytoplasm of Scottish black-faced sheep and the nucleus of breast cells of FenDorset ewe coordinate with each other.
It is wrong to explain the order logically.
I did it after reading it. I hope I can help you.
Question 4: Why is the unique nature colorful?
Question 5: Is the reading of the Chinese exam of the Third Education Department in Pudong, Shanghai an expository text? What is it? It takes "explanation" as the main form of expression, and takes imparting scientific knowledge as the fundamental task, introducing things, clarifying things, and explaining the movement, change and development law of explanatory writing. Therefore, when reading this kind of article, it is natural to grasp the object of explanation and its characteristics and see how it is "said". For example, the article "Wonderful Cloning" in Unit 6 of Grade Two in junior high school may be read three times: First, grasp the outline-grasp the explanation points as a whole. The purpose of writing is to tell the reader something or something. The knowledge conveyed by the author is the point of explanation, which is the central idea of plain text. So how to grasp it? There are three main methods: first, you can grasp the title of the article and make the main points clear. As the saying goes, "the title is the eye of the article", and the title of the explanatory text often reveals the center of the explanation. First look at the general title: "Wonderful Cloning", which shows that this is a knowledge introduction about magical cloning technology and reveals the secret of "cloning"; Looking at the content again, the full text uses four subheadings: what is cloning, cloning sheep "Dolly" before and after the birth of crucian carp, and cloning technology benefits mankind. Just glance at the subtitle of the text and you will have a general understanding of the content of the work. Secondly, we can grasp the structure of the article and summarize the main points of explanation. General expositions tend to focus on a main issue or content, while some expositions need us to summarize the small explanatory points to form the explanatory points of the full text. For example, Wonderful Cloning uses a parallel structure to explain cloning from different aspects. In addition to the subheadings we mentioned earlier (or like some articles without subheadings), we can also summarize them according to the content structure of four parts. That is the significance, experiment, development and benefits of cloning. In addition, you can grasp the order of explanation and make the main points clear. Everything has its own order, and people know things according to a certain order, so sorting out the order of articles is helpful to clarify the center of explanation. For example, this passage mainly expounds things, and undoubtedly adopts a logical order: first write the meaning of cloning, then write the experiment of cloning, then write the development of cloning, and finally write the benefits of cloning to human beings and the thinking of cloning. The context of the writing is very clear, indicating that things are proceeding step by step, and the center of the article is clear at a glance. Second, reading intensive reading analysis-detailed discussion method If you want to explain things clearly and thoroughly, you must be inseparable from the interpretation method. Therefore, when reading expository articles, we should grasp the main methods of expository articles, and make clear the relationship and function of various methods of expository articles, so as to grasp the content and structure of expository articles more accurately. We might as well start from the following two aspects: first, we can extract the interpretation methods of each part from the full text. You might as well make a list and have a look. Second, we can grasp the key paragraphs and analyze the specific explanation methods. For example, in "What is cloning?" The author explains "cloning" in three ways: example, explanation and quotation. Examples: cite familiar examples from plants and animals to explain, and make difficult scientific knowledge concise and easy to understand; Interpretation: trace the source of the word cloning and explain it; Quotations: The story that the Monkey King, who was introduced into The Journey to the West, pulled out a handful of monkey hair and turned it into a large group of monkeys vividly illustrates what "cloning" is all about and makes science and technology interesting. Third, reading taste-capturing the emotional points of chewing, like other styles, explanatory text also "speaks" the author's emotional attitude, which is indispensable for us to understand the text. Wonderful Cloning is a popular science article written by biologist Tan Jiazhen. To learn this text, we should not only understand the cloned scientific and technological achievements, but also learn the spirit of scientists' perseverance and constant climbing on the road of science, and have a preliminary understanding of science as a "double-edged sword". In order to explain what cloning is, the author carefully organized the materials and clearly introduced what cloning is, the development of cloning technology, the birth of Dolly the Sheep and how cloning technology benefits mankind. But the author is not limited to the general knowledge introduction, but incorporates his own appreciation and serious thinking. Specifically, this paper not only introduces us to the scientific knowledge of cloning, but also shows the "scientific spirit" including China scientists, and leads readers to look at the development of science and technology in an all-round way. When reading, we should find out the sentences that can express the rigorous, realistic and persistent attitude and spirit of scientists and appreciate them. For example: (1) "Use the cells of crucian carp in blastocyst stage ... >; & gt
Question 6: What is cloning? Can anyone make it clear? A bacterium can split in two after about 20 minutes; A grape branch cut into ten segments may become ten Portuguese plants; Cactus is cut into several pieces, and each piece takes root when it hits the ground; A strawberry can grow hundreds of strawberry seedlings a year by its creeping stolons ... all these are the reproduction of offspring by an organism by splitting itself in two or expanding a small part of itself. This reproduction is called asexual reproduction. The English name of asexual reproduction is "Clone", transliterated as "Clone". In fact, the word "clone" in English comes from the Greek word "clone". Today, the meaning of "cloning" is not only "asexual reproduction", but also refers to a group of individuals who have undergone asexual reproduction from an ancestor. This group of asexual offspring from an ancestor is also called "asexual cloning", or cloning for short.
Many animals in nature, under normal circumstances, rely on male cells (* * *) produced by their fathers and female cells (eggs) produced by their mothers to fuse (fertilize) into fertilized eggs (zygotes), and then the fertilized eggs develop into embryos through a series of cell division, and finally form new individuals. This kind of reproduction mode, which relies on both parents to provide sex cells and produces offspring through the fusion of bisexual cells, is called sexual reproduction. If we divide an embryo into two, four and eight pieces by surgery, and finally let an embryo grow into two, four and eight pieces ... Organisms are cloned individuals through special methods, and these two, four and eight ... individuals are called asexual clones (also called clones).
It can be said that Wu Cheng'en, a great writer in China in the Ming Dynasty, described the idea of cloning wonderfully ―― the Monkey King often pulled out a handful of monkey hair at a critical moment and turned it into a large group of monkeys, and the monkey hair turned into a monkey is a cloned monkey.
1In the spring of 979, scientists from Wuhan Institute of Hydrobiology, Chinese Academy of Sciences artificially cultured the cells in the blastocyst stage of crucian carp. After 59 generations of continuous subculture for 385 days, the nucleus was sucked out of the cultured cells by a glass tube with a diameter of about 65438 00 microns under a microscope. At the same time, the nucleus of crucian carp eggs was removed to prepare the eggs for accepting blastocyst nuclei. After everything is ready, the nucleus sucked out of the glass tube is moved into the empty position of crucian carp eggs, and most of the blastocyst nuclei under artificial culture die prematurely. Of the 189 eggs exchanged by nuclear exchange, only two hatched fry, and finally only one young fish survived the difficulties. After more than 80 days of culture, it grew into a crucian carp with a body length of 8 cm. This kind of crucian carp has not been combined with male and female cells, but only replaced the nucleus of a blastocyst with an egg cell, which is actually produced by the egg after nuclear replacement, so it is also a cloned fish.
Before the emergence of cloned crucian carp, scientists from Oxford University in England had conducted cloning experiments with a Xenopus laevis (Xenopus laevis) in 1960 and 1962. The experimental method is to irradiate Xenopus laevis eggs with ultraviolet rays to destroy their nuclei, and then take out the nuclei from the intestinal epithelial cells, liver cells and kidney cells of Xenopus laevis tadpoles through superb surgery, and accurately put the nuclei of these cells into the eggs whose nuclei have been destroyed by ultraviolet rays. After careful care, some of these nuclear exchange eggs finally grew up alive and kicking Xenopus laevis, which was not produced by the combination of sperm cells and egg cells, so it was also a cloned Xenopus laevis.
Tong Dizhou, a famous biologist in China, successfully conducted the cloning experiment of Rana nigromaculata in 1978. He transplanted the red cell nucleus of Rana nigromaculata into the eggs of Rana nigromaculata which had been enucleated in advance, and the eggs after enucleation eventually grew into tadpoles that could swim freely in the water.
With the maturity of fish nuclear exchange technology and the success of amphibian nuclear exchange, a group of scientists engaged in seed cultivation are excited. Since the nucleus of crucian carp blastocysts can replace the nucleus of crucian carp eggs to obtain cloned fish, can the nuclear exchange of heterogeneous fish get new hybrid fish? Scientists in China first proposed and solved this problem, that is, the research institute that successfully cultivated cloned crucian carp managed to replace the nucleus of crucian carp embryo cells with the nucleus of crucian carp egg cells. The nucleus of carp and the cytoplasm of crucian carp eggs can coexist peacefully and begin a process similar to the division and development of fertilized eggs. Finally, a kind of "crucian carp" with a beard grows very fast, just like carp, but its lateral scales and spines are the same as those of crucian carp, and the taste of fish is no less than that of crucian carp. The emergence of this new species of artificially cloned fish has opened up a new way for fish breeding.
The pursuit of science is endless, and the success of fish and amphibian cloning naturally makes science >>