Chapter 164

After the statistics of all the fields, everyone first focused on the fields No. 10 and No. 11.

According to the past thinking, the hybrid of high stem pea and low stem pea should produce two kinds of peas of random height, or the medium height pea of compromise, and even the difference may be due to the difference of pistil and pistil. But no one thought that these two hybrid fields were all high stem peas without exception.

This is contrary to the past cognition, which makes the students very surprised.

as like as two peas in common sense, a couple with different backgrounds should be similar to the other, or intercepted the middle characteristics of the two characteristics. The peas are like children who are exactly like the couple, but are not like the other party.

"The blood factor I imagined could control the height of peas, but there are three hypotheses about how to control it."

'at the same time, I started drawing on the paper,' he explained.

"First, the blood factor that controls height will take effect at random, and the offspring will get the blood factor of the previous generation at random. If this argument holds, then the experimental phenomenon should be..."

instead of rushing to finish, he looked at three students, hoping that they would have their own independent thinking.

"If that's the case, it's going to be a random high or low stemmed pea that comes out of a cross between a high stemmed pea and a low stemmed pea."

The summer Luo preempts to reply a way, her thinking is very nimble, guessed the answer all of a sudden.

"Right."

Lena nodded to Charlotte, making the girl smile shyly.

"The second guess is that the blood factor controlling height will take effect at the same time, and the offspring will get two blood factors, which will be displayed after fusion. If this guess is correct, what will happen?"

"Peas have high, low, or medium height stems."

Fina simply replied that she had done well. After Charlotte's answer, she naturally understood Lena's intention.

"That's right."

Lena smiles. Although fina doesn't show much, Dana is reluctant to see that the other two have been praised. She secretly clenches her fist.

"The third guess is that the offspring will get two kinds of blood factors from the previous generation, but one of them is more powerful and completely suppresses the other. If this guess is true..."

Lena looks at Dana, which makes the young woman more worried. She racks her brains and finally answers in a flash.

"Then peas may show one characteristic entirely, all of which are tall or short stalked."

Hearing Dana's answer, all the students looked at the two fields together. The tall peas were growing vigorously and bearing full pods.

"So the blood factor of the high stalk is stronger than that of the low stalk, so that all peas become high stalks?"

Xia Luo murmured to herself.

"At present, it can be said that it is true. I call this more powerful blood factor dominant blood factor, while the corresponding weak blood factor recessive blood factor."

Reiner added that the control method he used was very common in biological experiments, and he took the opportunity to introduce it to his students.

"At the same time, I conducted two groups of experiments to exclude the influence of gender by exchanging pistils and stamens of two kinds of peas. We can see that gender will not affect the traits of offspring unless there are special circumstances."

"Wait a minute, Mr. Reiner, there is another question in this hypothesis, that is, what does the blood factor of high stem do to the blood factor of low stem? Is it completely engulfed, assimilated, or simply suppressed?"

Fina was the first to ask questions. Her deep thinking made Lena nod slightly.

"Your thinking is right, fina. It seems that you have mastered how to think logically and consider every possibility of the problem."

Lena's praise stunned the quiet girl, and then she pursed her lips a little and didn't speak.

"Now we can carry out the design experiment for this problem. Due to hybridization, we have obtained the finished product of high stem and low stem peas. Next, our second round of planting will make these peas self pollinate normally. In this way, we can see what is the actual situation of blood factor of high stem peas hybridized with the same blood factor What

With that, Lena turned to the three students again.

"You can put forward some hypotheses and analyze the reasons at the same time, and then determine whether they are consistent according to the experimental phenomena."

"If it is completely engulfed and assimilated, then the second generation peas only have high stem blood factor, and the third generation peas should all be high stem peas."

Charlotte said methodically, which attracted Dana's slightly envious eyes.

"If there is only simple suppression, then the second generation pea has two blood factors, and the third generation pea produced by self pollination... May have two traits of high stem and short stem!"After a little thought, Charlotte completed her guess.

"Wait a minute, doesn't it mean that the pea with high stem has a short stem, and the character that didn't exist in the previous generation appears in the next generation?"

Dana was a little surprised. She would never believe such a conclusion in the past, but at this time, it came from the logical reasoning step by step, which was convincing.

"It's hard to believe, but if there are short stemmed plants in the third generation of peas, then this conclusion should be correct."

Fina nodded and looked back at Lena.

"Mr. Reiner, there should be more than one similar trait. We can also use other traits for verification experiments."

"Well, yes. In fact, I have obtained several kinds of seeds with different characteristics through hybridization. In the first round of planting, we mainly investigated the transmission law of characters, while in the second round, we discussed how blood factors affect characters."

In conclusion, Lena felt that the results of the first round of planting were enough to inspire these students to think independently.

After confirming the condition of all the fields, they sowed the classified hybrid seeds. About four days later, they could observe the condition of the third generation peas.

In fact, logically, if the dominant factor can completely assimilate the recessive factor, then the recessive factor should be extremely rare in nature, completely contrary to the rich and colorful nature that people can observe. Here, we can predict the results of some experiments.

But Lena knew that in the end, everything had to be based on practice.

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