Hurry, hurry! Biology master enters, please, well said and thank you!

First of all, genes exist in pairs, so AABB is a gene, AB or something is just a gamete, each gene has only two gametes, unless genetic mutation occurs, but AAAABBBB genes are easy to be mistaken for four gametes, in fact, there are only two, both gametes are AAB, indicating that the organism is a tetraploid, and the next few books of high school biology will be learned.

As for hybridization, its purpose is to obtain a variety of different biological phenotypes, that is, to obtain different traits, and then through the selection of different traits to obtain the required excellent varieties and apply and produce, and the purpose is to obtain inbred or inbreeding raw materials, and the ultimate purpose is to select excellent traits.

Hybridization is the intersection of two organisms: it includes: self-breeding, crossing, etc., and hybridization has a wide range of applications in breeding.

It includes: inbreeding, overcrossing and other inbred is the intersection of two individuals of the same genotype, in cross breeding, through repeated inbreeding, homozygous plants can be obtained. Measurement:

It refers to the intersection of an individual of an unknown genotype with a recessive type in order to determine the genotype of an individual of an unknown genotype. The original gene is AABB means that there are two pairs of alleles and they are heterozygous. The ab et al. you are talking about is the genotype of the gamete and contains only one of the alleles.

Instead of having only two gametes per gene, it means analyzing these two genes in gametes (because there are actually many genes in gametes, and only these two are currently or in the title). Wish.

It depends on how many pairs of genes are in a cell, and sometimes there are three pairs of genes that may be AABCC, and his gametes may be ABC

Because both the paternal and maternal lines will provide 1 to 2 genes.

The answer is: d.

A is false, human sickle is cautious cell anemia is directly manifested by protein, while phenylketonuria is indirectly manifested by protein;

B is wrong, protein synthesis requires not only mRNA as a template and tRNA as a carrier of amino acids, but also enzymes, energy, etc.;

c False, the protein synthesis of the virus itself needs to be carried out in living cells, and the raw materials and energy required are provided by the host cell;

dCorrect, if there is no cyclic polypeptide, you can know how many peptide bonds there are, if there is a cyclic polypeptide in it, the number of peptide bonds in this protein is not determined.

Choose d bar Qingzai, I'm not sure, the high school ruler is learning almost and I don't answer the sleepy Wang Duo and go back

1Do flies love melons?

2 If there are several foods, flies will choose melons.

3. Comparison of different foods with melons.

4. Different foods should be designed to ensure that the number of flies is sufficient and the number of experiments is large.

5. Flies prefer to eat melons among the several foods used.

Congenital behaviors Predatory behavior Genetic material.

Flies can transmit some diseases, and by targeting the characteristics of flies that love certain foods such as melons, more specific fly-killing drugs can be created to reduce the harm of flies to humans.

The first one is pretty much the standard answer, and the last one you refer to.

1.The following statement about the water content of plants is correct.

a.Sun-dried seeds do not contain water errors. Sun-dried seeds have very little free water, but there is bound water bThe water content of young leaves is more than that of senile leaves.

c.The water in the plant cells is stored in vacuoles. In the cytoplasmic matrix, and in various organelles, there is the presence of water.

2.The pathways by which water circulates in the biosphere are correctly described in the following items is aAtmosphere, plant roots, plants, leaves, atmosphere, wrong. Lack of precipitation.

b.Atmosphere, Natural precipitation, plant roots, plants, leaves, atmosphere, pairs. Natural precipitation in plant roots is the process of root water absorption. Leaf atmosphere is leaf transpiration.

c.Plant Leaves Plant Roots Groundwater Atmosphere Wrong DNatural precipitation Plant stems and leaves Plant roots Atmospheric Wrong.

Question 1 is B and B is chosen for the second question

1.Pick B.

A, sun-dried seeds also contain a small amount of water.

c, the cytoplasm also contains water.

2 choose B. This sequence is also correct, and the steps are complete. A is missing and will follow, and C and D are not in the right direction.

Year 1: Self-pollination;

Year 2: Wrinkles; 1/4；

Year 3: Tall stems; 3/4；wrinkles;

Year 4: Plant F3 seeds, keeping tall stems; The offspring are planted without dwarf plants;

1.the law of segregation of genes; genotype and phenotype;

Seed; 3 types;

It was a long time ago that the high exam questions, the purpose of which in itself required that the theme of the birth of two girls was normal and pure, and could be considered with a probability of 1 in 4.

If you overcome the topic, the answer is wrong, you have determined that the premise is that it is a girl, and the phenotype is normal. When the operator to Cardiff: 2 3aa wife:

2 3 aa time, there is a probability of 2 3 aa, aa, 1 3 probability. : multiply by (1 3) 2

But for many years, or 1 out of 4 answers, I have also encountered when our teacher said that there was a problem with the expression of this topic, but fortunately, the high exam questions Your teacher did not say it?

RRDD was crossed with RRDD to obtain offspring of DDRR, and DDRR inbred with 9 genotypes, namely 1 16DDR, 2 16DDR, 1 16DDR, 2 16DDR, 4 16DDR, 2 16DDR, 2 16DDR, 1 16DDR, 1 16DDR

In the third year, the genotypes of the selected plants were 1 16ddrr and 2 16ddrr, which were inbred respectively, and the DDRR offspring were all wrinkled peas, and the 3 4 of 2 16ddrr in the Ddrr offspring were 2 16ddrr, and the ratio of ddrr, ddrr and ddrr was 1:2:1, so in the fourth year of this breeding program, the algorithm that could determine the proportion of the genotype of the plants in the total number of plants in that year was about 1 2 (1 16ddrr + 1 4ddrr*2). 16ddrr) (1 16ddrr+2 16ddrr)=1 2。

Answer: d

The direct energy source for cellular life activities is ATP, and the only way to produce ATP is photosynthesis and respiration. Thus, the structures that produce energy are chloroplast, intrathylac membrane, cytoplasmic matrix, and mitochondria. Mitochondria are the main site of energy production, and about 95% of the energy in the cell is provided by mitochondria.

Therefore, it can only be said that mitochondria are the main place of production of energy required for the life activities of cells.

D, mitochondria do release energy, in the form of ATP. The guy upstairs talks about this from a plant perspective. If it is an animal, this statement is also wrong.

Because cells not only undergo aerobic respiration, but also anaerobic respiration, ATP is produced in the cytoplasmic matrix. It would also be wrong to say that all the ATP of aerobic respiration comes from mitochondria, because the first stage of aerobic respiration occurs within the cytoplasmic matrix, and a small amount of ATP is also produced.

d: The cytoplasmic matrix can also produce energy, and b. the cytoplasmic matrix is also required. Pick out two, what to do.

d, anaerobic respiration without mitochondria.

Soil fertility is the ability of the soil to provide and coordinate nutrient and environmental conditions for plant growth. It is the comprehensive expression of various basic properties of soil, the most essential feature of soil that distinguishes it from the parent material and other natural bodies, and the material basis of soil as a natural resource and agricultural production materials. Soil fertility can be divided into natural fertility and artificial fertility according to its causes.

The former refers to the fertility formed under the influence of five major soil-forming factors (climate, biology, parent material, topography and age), which mainly exists in uncultivated natural soils. The latter refers to the fertility that has been exhibited over a long period of time under the influence of human farming, fertilization, irrigation and various other agricultural activities, mainly in cultivated (farmland) soils.

Landscape heterogeneity: the unevenness and complexity of the spatial structure of the landscape system.

Soil degradation in English: soil degradation; Soil Deterioration Definition 1: The process of declining soil fertility, deterioration of plant growing conditions and decreasing soil productivity due to changes in the natural environment and improper use of human resources.

Discipline: Geography (first-level discipline); Soil Geography (Secondary Discipline) Definition 2: The process that occurs under the influence of various natural, especially anthropogenic factors, that leads to the temporary or permanent decline of soil quality and its sustainability, or even the complete loss of its physical, chemical and biological characteristics.

Discipline: Ecology (first-level discipline); Pollution Ecology (Secondary Discipline) Definition 3: The process of declining soil fertility, deteriorating plant growth conditions and decreasing soil productivity caused by poor natural environmental factors and improper human use.

Soil degradation, also known as soil weakness, refers to the process of declining soil fertility leading to a decrease in productivity. It is a comprehensive characterization of the deterioration of soil environment and soil physical and chemical properties, with the decrease of organic matter content, the reduction of nutrients, and the destruction of soil structure. Soil erosion, shallow soil layer, soil compaction; Soil salinization, acidification, desertification, etc. Among them, the decline of organic matter is the main indicator of soil degradation.

In arid and semi-arid areas, the original sparse vegetation is destroyed and the soil is desertified, which is a serious phenomenon of soil degradation.