Hurry! Two questions for sophomore biology, ask one sophomore biology question! Hurry forward!!

1. Because introns cannot be encoded as proteins, DNA sequences do not fully correspond to protein sequences, especially in eukaryotes, almost none of which directly correspond to DNA sequences.

2. The genes of eukaryotes are divided into coding regions and non-coding regions, and the non-coding regions have exons and introns, and introns cannot be encoded as proteins, so they cannot be directly used for gene amplification.

1 Because the DNA sequence does not exactly correspond to the protein sequence, especially in eukaryotes, almost none of the protein sequences directly correspond to the DNA sequence.

2. The genes of eukaryotes are divided into coding regions and non-coding regions, and the non-coding regions have exons and introns, and introns cannot be encoded as proteins, so they cannot be directly used for gene amplification.

Genes need to be transcribed before translation, and in this process, not the entire DNA will be transcribed, but a part of it, so when it is translated into proteins, only a part of the corresponding DNA is generated, so this part of the gene is called exons, and the untranscribed and translated ones are called introns. So my personal opinion is that the first question is a bit unclear.

As for the second question, the sequence and structure of proteins are still not fully explained by humans, proteins are composed of multiple chains, and they are also complex in spatial structure, so people have evolved complex systems, from DNA to RNA, one genetive, one translation, so that there is a more stable system, and the structure is more stable.

The auxin released from the top of the selected plant is polar from the upper end of the morphology to the lower end of the morphology, and it is easy to accumulate at the side buds. Auxin, on the other hand, has a duality. The concentration of auxin accumulated at the side buds was too high, which inhibited the growth of the side buds.

After the apical bud is removed, the auxin at the side bud no longer accumulates, the concentration becomes smaller, and the growth of the side bud is not inhibited.

b.The buds and young leaves of plants are the main sites of auxin production. One of the physiological effects of auxin is to promote rooting. So cuttings that retain buds or young leaves are more likely to take root and are more likely to survive.

c.Promoting the ripening of the fruit is the action of ethylene rather than auxin. Ethylene is widely found in all parts of the plant, mainly in ripe fruits.

The 4-D solution is an auxin analogue. The developing seeds release auxin, which promotes the development of the fruit. Without pollination, the pistil does not produce seeds, but in order for the fruit to develop properly, a certain concentration of auxin analogues is sprayed on the stigma of the pistil, so that the fruit without seeds is obtained.

c Put the ripe papaya into the unripe persimmon, which is conducive to the ripening of the persimmon.

This is where ethylene comes in.

c。。。Ethylene counts as a plant hormone but not auxin...

Auxin is the one that promotes the growth of plants and Ethylene is the one that promotes maturation

c.Persimmon ripening uses the effect of ethylene to promote fruit ripening.

Choose C, which is related to ethylene.

1: d can be deduced that the parental genotypes are AAX BY and AAX BX B (a, a for albinism, b, b for color blindness) 1 4 times 1 4 = 1 16

2：d3：a

4:d A man's x can only be passed on to his daughter, and his daughter's x can be passed on to his grandson, not his granddaughter.

You tell me which traits are dominant traits and which are recessive traits, I just came back from the holidays and I didn't bring a book.

Kid, read the book yourself, it's not a problem.