Junior high school biology short answer questions, junior high school biology questions

Color blindness is recessively inherited on the X chromosome and for females it takes two colorblindness pathogenic genes A to show symptoms of color blindness.

Men with XY will have an A to show excellent blindness.

If a woman is sick, then a woman is XAXA

Males are disease-free and do not carry the causative gene A as XY

If a son is born male provides y female provides xa and the child is xay, it is color blind.

If a daughter is born male for x female for xa child is xax, it must not be color blind.

Let d be the normal gene and d be the color blindness gene.

Male normal gene x female color blind gene.

Scenario 1: The genome of a child born to dd x dd becomes: dd (normal) 100 percent].

Scenario 2: The genome of a child born to dd x dd becomes: dd (normal) or dd (color blindness).

50 percent each].

That's about it!! If you don't understand, you can still ask me!

Boys are completely color blind. Girls 1 2 are color blind and 1 2 are normal.

1. According to Yang Ming's experimental design, it can be speculated whether water and light are the environmental conditions required for seed germination.

2 Experiments A and B are controlled, the variable is ( water ) The conclusion that can be drawn from this set of experiments is (water is required for seed germination).

3. According to the experimental results of experiment A and (C), light is not the environmental condition for seed germination. Please explain why (the seeds are not photosynthesized when they are not yet chloroplasts).

4 In the experimental design, experiments B and (C) could not be controlled because there were (2) variables.

5 If there is enough air, 2 seeds in experiment A did not germinate. The possible causes of this are (too much water, less aerobic respiration, not easy for plants to grow).

1. Lighting. 2. Dry and wet state of cotton Seed germination needs to be in a humid environment.

3C Because they have the same germination rate except for the light, and other conditions are the same.

4C 25 The seed itself is problematic.

1. Lighting. 2) Cotton wet and dry state Seeds need water for germination.

3) C Under the same temperature and humidity conditions, A is cultivated in the dark and D is cultivated in sunlight, but the number of seed germination is basically the same.

4) C two.

5) Seeds are embryonic.

1a, dark environments, algae and fish all consume oxygen, that is, the fewer organisms in the bottle, the longer they will survive.

2b, The causative agent of anthrax is bacteria, but cannot decompose organic matter.

3c, the answer is obvious, orchid bees do not eat orchids, it should coexist.

A, the leukocytosis of the nail, leukocytosis indicates that the body is diseased.

1. The fish in the following fish tank (the same size of the fish and tank) placed in the dark place can survive to the end.

a2 fish in a tank of clear water Algae in the dark can only breathe, cannot photosynthesize, and will compete with fish for oxygen.

On 11 September of this year, a "plane collision incident" occurred in the United States that shocked the world. Since this terrorist campaign, US lawmakers have been plagued by "anthrax". The pathogen of "anthrax" belongs to the ecosystem:

b Consumer Bacillus anthracis is a parasitic bacterium, and all parasitic organisms are consumers.

3. There is a kind of orchid bee, in the breeding season, the drone specially collects the fragrance substances of orchids. Then, many drones gather together and at the same time release the aroma to attract the females to come and mate. The analysis of this phenomenon is wrong:

The predatory relationship between the orchid and the orchid bee The orchid bee only collects the fragrance substances of the orchid, and does not eat the orchid.

4. At the peak of influenza A, a hospital received two patients with high fever, and their blood test results are shown in the figure below.

From this, the doctor judged (A) to be a suspected patient.

There are fewer nail red blood cells and more white blood cells.

1d In this "mini" ecosystem, the consumer of 10 fish exceeds its carrying capacity, and a producer is also needed, which is called algae; 2b This bacterium is a heterotrophic organism that cannot produce nutrients, and cannot decompose and transform all organic matter into inorganic matter, and its relationship with humans is parasitic, and it can only be a consumer; 3c It should be a mutually beneficial and symbiotic relationship; 4 A because of its abnormally high white blood cells.