Urgent Biology Problem Solution, Biology Problem, Solution

Autosomes are the ones that everyone has, the f (or f) sex chromosome gene e(e).

A and C are male individuals.

Female. Personal opinion. Interested in a**.

The seeds must be dried before they are put into storage to reduce the moisture content in the seeds, this is because of 1Reducing the water content can reduce respiration and prevent seed germination, 2Reducing the water content inhibits microbial activity and prevents mold growth in the seeds.

The water content standards for stored grain vary from place to place, and the reason is that the humidity is different from place to place, so the water content that seeds can store is also different.

1.Reduces the respiration of seeds and reduces the consumption of nutrients.

2.Inhibits the proliferation of microorganisms and is not easy to mold and deteriorate.

Climates and temperatures vary from place to place, so regulations naturally vary.

Seeds must be dried before they are put into storage to reduce the moisture content in the seeds, because:

1.Reduces free water inside the seeds to prevent seed germination.

2..The respiration rate of the seeds is reduced, so that too much sugar is consumed, and the water content standards for the stored grain are different from place to place, and the reason is that the air humidity is different from place to place.

1 d When it comes to cell recognition, it is glycoproteins.

2 BC cocci (shape bacteria) are all bacteria, bacteria have cell wall, cell membrane, cytoplasm, where cytoplasm has only ribosomes.

3 Definition of the group of B chromosomes.

The concentration of cell fluid is large on the 5th day, and the concentration of the external solution is smaller, so the water absorption ability is strong, and the auxin promotes growth on the 6th day, and the young parts are more synthesized. Morphologically the upper end is more synthetic (not just the apical bud).

7 Did you make any mistakes?

8 a Look at photosynthesis**.

9 b a salivary glands are not c are not d ovaries are not 10 b blue when exposed to iodine, indicating that starch is produced, indicating that photosynthesis has occurred, and chloroplasts mainly absorb red, blue, and violet light; The most CO2 is produced, indicating that photosynthesis is the weakest and respiration is the strongest, while chloroplasts do not absorb green light.

12 a drawing**, if you don't understand I'll explain it to you.

13 d gas molecules glycerol ethanol on these three free diffusion15 d seeds are seeds.

16 c DNA replication can be in the nucleus, the nucleus does not belong to the organelle18 b Write the sequence of the two types of mRNA, you can know the concept of tRNA19 b The cell wall is fully permeable, and the nuclear pore allows large molecules to enter and exit (RNA proteins) 20 C homologous chromosomes.

Glycoproteins have a recognition function.

Bacteria are prokaryotes.

It should be the meristem of the apical bud.

1. A Reason AAB can be cultivated by using the haploid AB of the first plant

2. There is an error in the second question: the female mouse and the female mouse are crossed, the idea is that the gene mutation and the offspring are all wild and mutated must be dominant, if on the X chromosome, when the mutant male mouse and the wild female mouse are crossed, the female mouse is all mutated, and the male mouse is all wild, otherwise autosome.

3. b Just remember that polyploid metabolism is vigorous, adaptable to the environment, and it is manifested as disease resistance, drought resistance, cold tolerance, and wide distribution.

4. D. The sex ratio of the population is generally divided into three types: male and female equivalent: characterized by the fact that the number of females and males is approximately equal. This type is more common in higher animals.

Females and males: Characterized by a significant number of females than males. This type is commonly found in artificially controlled populations and groups of animals such as bees and elephant seals, where hundreds of male bees, one queen bee and hundreds of thousands of worker bees are all females.

2) Female and male polymorphism: It is characterized by a significant number of males than females. This type is rare.

Such as domestic termites and other animals that operate social sexual life. If bees only look at individuals with reproductive ability, they can also be regarded as female and male polymorphic.

a Favorable mutations are retained and the original gene pool must be changed b Migration and migration strengthen gene exchange c Small population The base is small.

5. b No need to explain, just remember.

6. (1) A35% calculates 39% 2+20% A65% calculates 30% 2+%50

2）aa20%*20%=4% aa50%*50%=25% a35% a65%

3) The genotype tends to be heterozygous and the population tends to be stable.

7. d The environment determines the direction of natural selection.

c Analysis:

There are two types of inheritance in eukaryotes: nuclear inheritance and cytoplasmic inheritance, and the possibility of cytoplasmic inheritance cannot be excluded without a control group.

Grafting B's umbrella stalk onto A's pseudoroot cannot be proven, because you can't always observe whether it's the regulation of the nucleus or the cytoplasm alone.

I think this experiment is best to first grow B's pseudoroot cells into two or more spare parts, remove the nucleus from one of the cells, inject the nucleus of A's pseudoroot cells, and then perform the experiment in the title.

Your question has been answered (meow.

I'm very happy if it is

c A control experiment should be set up as follows: B's umbrella handle is grafted onto A's false roots, cultivated under the same and suitable conditions, and the first umbrella cap shows an intermediate type of A and B. If the middle type of cap is removed, the cap will be the same as the cap of the nail.

However, even if the above controlled experiments are set up, it can only be shown that the shape of the umbrella cap is determined by the false root, not by the umbrella handle. Nuclear transplantation experiments are needed to fully prove that the shape of the umbrella cap is determined by the nucleus.

c, the experiment is incomplete, and a control should be designed.

Seemingly. It seems like. Should. It may be a not quite sure ...