Analyze the evolutionary types and causes of organisms from the domestication process of goldfish

1.The type is differentiated evolution, due to the struggle for survival and directional changes in gene frequencies.

2.There are four types of evolution, namely, compound evolution (from simple to complex, from low to high), differentiated evolution (adaptation of organisms to different living environments, multi-directional differentiation, but their evolutionary level is still the same level in terms of morphological structure and physiological function), specialized evolution (refers to a specific adaptation of a species to a unique living environment and forms a specific adaptation of overdeveloped local organs, which is a special case of differentiated evolution), simplified evolution (also known as degeneration). Evolutionary approaches from complex to simple.

It is usually a special adaptation of organisms to parasitic or sessile life, which manifests the deterioration of most organs or physiological functions, and the relatively developed skills of individual organs or victories, which is a special case of differentiated evolution).

3.The evolutionary cause is not genetic variation and natural selection of three points. And it's not the reason, it's the link. The three basic links are mutation (including gene mutation & chromosomal variation), genetic recombination, and natural selection.

Evolutionary types: e.g. fish, amphibians, reptiles, etc. Variation provides the possibility for the evolution of organisms, and through natural selection, there are species of organisms that have favorable variation, and their genes adapted to the environment are passed on to their offspring, and so on, and so on.

All living things have to be like this.

1. Socio-economic factors. The varieties formed by artificial selection will inevitably change with social and economic development.

2. Market needs. The functional structure of varieties changes with the change of market needs. The obvious fact is that pork production has shifted from fat to lean meat, and from small pigs to pigs.

3. Production level. With the improvement of social production level, the functional morphological structure of varieties at each stage has also undergone obvious changes. Purebred domestic animals used in traditional animal production are all-round primitive breeds.

Purebred livestock used in modern animal production are specialized breeds with differentiated properties. The purebred livestock used in modern animal production are all specialized breeds of breeding and performance differentiation.

4. Degree of intensification. With the efficient concentration of social production, the number of animal breeds and their applications have been significantly affected.

5. Light, temperature, rainfall, air, altitude, topography, land, etc. in the natural environment will always affect the formation and evolution of varieties.

6. Climate impacts. The main basis of climate refers to the direct and indirect effects of temperature and humidity on animals. The direct impact is manifested in the body structure and size of the animal. The indirect effect is manifested in the growth state of vegetation, which in turn changes the body structure of the animal through feeding.

7. Altitude influence. Altitude is mainly the direct and indirect influence of air pressure and air composition on animals. Animals at high altitudes have well-developed circulatory and respiratory organs, high red blood cells in the blood, and high iron synthesis.

8. Light influence. Light mainly refers to the direct and indirect effects of sunlight on animals. Light affects the endocrine changes of individuals through vision and nerves, which in turn affect reproduction, egg laying, and moulting.

Goldfish are ornamental fish domesticated from wild crucian carp.

China was the first country to domesticate goldfish. In nature, the body color of the crucian carp is gray on the back and white on the belly, and it is easy to avoid predators in natural water, and sometimes, the pigment cells of the crucian carp mutate to make the body of the fish golden yellow. Without human intervention, such mutants will be eaten by predators due to their ease of exposing their targets.

The Chinese began to discover and exploit this variation at an early age.

Goldfish have a gentle temperament and generally live for about 6 years, but there are also longer ones. Goldfish is an omnivorous carnivorous freshwater fish with well-developed throat teeth that can swallow harder baits. Goldfish have a strong ability to adapt to water temperature, but can not adapt to the drastic changes in temperature, its suitable water temperature is 18-26, too high or too low will affect the feeding and growth and reproduction of goldfish.

Goldfish prefer weakly alkaline water, and the pH value of the water body is more suitable.

Goldfish bai is made from Chinese crucian carp.

evolved. du, crucian carp zhì red crucian carp grass gold

DAO Single-tailed Goldfish Goldfish Multiple varieties of goldfish.

Originating in China, goldfish is also known as "golden crucian carp", which is similar to carp but has no mouth whiskers, and is an ornamental fish that evolved from crucian carp. There are many varieties of Jinquan fish, the color is red, orange, purple, blue, ink, silver-white, five-flower, etc., and it is divided into four strains: literary species, grass species, dragon species, and egg species. In the 12th century, the genetic research of goldfish domestication began, and after a long period of cultivation and continuous optimization of varieties, goldfish from all over the world are directly or indirectly introduced by China.

Goldfish are small in size and not aggressive, and they feel that they can be domesticated without domestication.

Goldfish are small, there is no tameness, there is no aggression, and they are raised at home.

Goldfish is evolved from crucian carp, and it is very beautiful from the outside, so most people choose to put it at home or in the company.

Goldfish should not be domesticated, and goldfish do not have any aggressiveness, so they are very suitable for domestication.

Personally, I don't think goldfish need to be domesticated, and there is no need to domesticate as an ornamental fish.

It should be that since ancient times, there have been people who have taken goldfish from wild to free-range and then to domestic.

From wild to release, from release to semi-domestication, from semi-domestication to domestication.

Goldfish are easier to raise, and they are more suitable for ornamentation.

From the time people found it, it felt that it was suitable for ornamentation, domestication, and relatively petite.

Appropriate water temperature, appropriate food, suitable male and female matching, timely removal of ovaries after spawning, and incubation is generally 5 to 7 days.

The teacher explains: the correct artificial breeding method of goldfish to avoid "deformation of the body of the breeding fish"!

Taxonomy is a basic method for studying organisms Taxonomy is mainly based on the similarity of organisms to divide organisms into different levels such as species and genera, and scientifically describe the morphological structure and other characteristics of each taxonomy to clarify the kinship and evolutionary relationship between different taxa The main basis for classification is the characteristics of organisms in terms of morphological structure According to the morphological structure and other characteristics of organisms, organisms are divided into animal kingdom, plant kingdom and other organisms (or microbial kingdom), such as goldfish belongs to the animal kingdom, The cells that make up the goldfish are eukaryotic cells, without cell walls, vacuoles, chloroplasts, and cannot carry out photosynthesis

Therefore, b

Taxonomy is a basic method for studying organisms Taxonomy is mainly based on the similarity of organisms to divide organisms into different levels such as species and genera, and scientifically describe the morphological structure and other characteristics of each taxonomy to clarify the kinship and evolutionary relationship between different taxa The main basis for classification is the characteristics of organisms in terms of morphological structure According to the morphological structure and other characteristics of organisms, organisms are divided into animal kingdom, plant kingdom and other organisms (or microbial kingdom), such as goldfish belongs to the animal kingdom, The cells that make up the goldfish are eukaryotic cells, without cell walls, vacuoles, chloroplasts, and cannot carry out photosynthesis

Therefore, b