4 high school biology questions

1b is wrong in H2O2 will also decompose itself at room temperature and pressure. D mistake in the control group is usually: under natural conditions, the microorganisms in the soil have a decomposition effect, it can only be used as the control group, and the soil with microorganisms removed is used as the experimental group.

The 2D mistake is that the variation is not directional, the selection is directional, and the artificial selection is also directional.

3. The energy in the remains of the producer, etc., is used by the decomposer, and the energy is obtained by decomposing the remains. The energy pyramid food chain you are talking about is the predation chain, where the producer and the consumer carry out the flow of energy through the predatory relationship. Decomposers do not prey on producers and consumers, but both producers and consumers are decomposers.

4: If a and a are used to indicate the gene that controls the trait, it can be seen that this is a disease controlled by the dominant gene according to the title diagram. No. 7 is the patient's genotype may be AA or AA, where the probability of being AA is 1 3, and the probability of being AA is 2 3 (the parents are AA, and the genotype of the child is sick can only be AA or AA, and the probability of being heterozygous AA (AA+AA)=2 3), and the 10th is AA, and the probability of two people having a normal child:

2 3aaxaa = 1 6aa, the probability of having a sick child is 5 6

1.Hydrogen peroxide decomposes when heated, interfering with the role of enzymes being studied.

Soil with microbes excluded is the experimental group.

2.Variations are all non-directed.

Wrong, indirect value is greater than direct There are words in the book.

The following figure shows the genetic pedigree of a family with chorea, if 7 and 10 are married, the probability of having a child with the disease is.

Choosing a 10 must be AA 7 is AA1 3 may AA2 3 may 1-2 3*1 2*1 2=5 6

1.Temperature experiments cannot be done with hydrogen peroxide, because temperature has a great influence on the decomposition of hydrogen peroxide.

The experiment was very incorrect, and in high school he only learned what he used to verify the high efficiency of the enzyme.

d.The one who was not treated at all was the control group, which was the experimental group.

2.Variation is not directional, natural selection is.

3.The energy stored in organic matter, the downstairs is right, this is the saprophytic chain. High school does not need to master, 4

There is no dominance in the middle, looking at the male disease, 4 is diseased, and 2 is not diseased, non-companion is autosomal dominant, the breakthrough of this kind of problem is in the place where there is no middle birth, from 3, 4 gave birth to the recessive 8 can know that they are aa....Because 7 has been identified as a patient, ruling out the possibility of not having the disease, the probability of 7 being AA is 2 3

Yes AA probability is 1 3...

Look at 5 is AA, AA and 9 is sure to have a gene.

5 and 6 can be launched, which are AA, AA respectively

So 10 can only be AA...

The probability of dominant inheritance is usually high. The first is not sick.

7:2 3aa x 10:aa = 1 6aa, so the sick one may be 1-1 6 = 5 6

It's all done by myself.

Finally, I wish you admission to your dream university.

Trivalent iron should be used for comparison. d. Control the variable method, but also variables, such as plants, temperature.

2.Root cause! It is a directed gene mutation.

3.Because the energy of the pyramid refers to the energy fixed by the living being, not in the remains. Not in the remains.

4.I can't see the diagram. sorry

Question 1, a high temperature will decompose hydrogen peroxide and affect the results of the experiment, d The decomposers in the soil are not only microorganisms, but also some animals also play the role of decomposers, such as dung beetles. Therefore, it is not possible to use soil that excludes microorganisms to conduct the test, which will affect the results of the experiment. Second, d-mutation is indefinite, while natural selection is directional.

The third question, it is true that the energy on the energy pyramid does not flow to the decomposer, but in the ecosystem, the decomposer can use the remains of living organisms, otherwise how would you want the decomposer to live... So what you're asking doesn't necessarily have to do with what the title says. Question 4, let's take a look first...