A few junior high school biology questions, and a few junior high school biology questions

, there are 3 kinds, the genes produced by aa can be a, a, and the possible combination is aa, aa, aa, the ratio is 1:2:1

The gene produced by AA can only be A, and the gene produced by AA can only be A, so it can only be AA

Hybrid peas have other genes in addition to DD, and there are many different combinations. If you don't take into account the other genes, then there are only 2 of them, d and d

The genes produced by aa are a, a, and the probability is 50%, and aa can only produce a, so the progeny is aa, and the probability of aa is 50%.

Since both parents have double eyelids, both parents are dominant and contain A, and the children are recessive, indicating that both parents can produce the recessive gene A, so they are both AA.

Since neither parent has an earlobe, therefore, the genes of the parents must be dd, and the gametes produced may only be d, and the offspring can only be dd, so it is impossible to have earlobes.

I hope it helps, the gene has a little relationship with the probability of mathematics, more derivation, not difficult to learn, I wish you success.

C. Inhale:

Enlarged lungs and thoracic enlargement.

Respiratory muscle contraction.

Diaphragm declines. The air pressure in the lungs is small and traces in the cavity and the outside atmospheric pressure.

The gas enters the lungs.

The interstitium between the alveoli contains a rich network of capillaries, which is the place for gas exchange between the blood and the gas in the alveoli of Huilao.

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.

2,b3,c

4,d5d6b7b

The first question, the answer is unfounded.