Haze weather

Chapter 18 "Dare to be bold."

Zhou Chiyu didn't say that this matter would rot in his stomach, and he couldn't tell it if he was killed, so this weekend, Xia Shitao couldn't hold back his gossip and shared this matter with Jiang Jun.

The relationship between Jiang Jun and Xia Shitao is very good, so good that they almost became brothers. Of course, this is probably just Xia Shitao's unilaterally thinking of good brothers. In fact, for Jiang Jun, Xia Shitao may be treated tenderly but not A step that dares to cross the line.

Of course, Jiang Jun also seized the opportunity to insinuate and successfully tested Xia Shitao's attitude towards Zhou Chiyu—as he hoped, Xia Shitao had no feelings for Zhou Chiyu.

Jiang Jun has a big mouth, which is especially reflected in the happy brows. When he is happy, he can't help sharing his joy with Song Boyang, so during a class break, he whispered in Song Boyang's ear, " I know something big."

Song Boyang turned the draft paper over, the capped nib was still shaking violently, he replied perfunctorily, "What?"

"I found out through my superb interrogation skills that Xia Shitao doesn't like Zhou Chiyu." Jiang Jun repeated, as if trying to convince himself and reassure himself, "Yes, she probably doesn't like it."

Xia Shitao is Jiang Jun's favorite girl, but not Song Boyang's sweetheart. Of course, Song Boyang is not interested. He only knows that he is stuck on a certain step when he is doing a question. If he didn't go up, his patience was on the verge of disappearing, and he was about to be tortured to the point of madness by the physics problem in his hand, so he casually echoed, "Well, that's great."

Song Boyang clamped the body of the pen between the index finger and ring finger of his right hand, and turned the pen rapidly. With his left elbow resting on the table, he unconsciously grabbed his hair.

Which step did I not figure out?Or are conditions under consideration?Why can't it be pushed out?

Next to him, Jiang Jun continued to exert his gossip spirit, "Then Xia Shitao told me a shocking secret, which is related to Zhou Chiyu."

The spinning pen in Song Boyang's hand suddenly stopped.

He hesitated for a while, but he still couldn't restrain his curiosity on the spur of the moment. He abandoned the half-finished physics problem, and turned to ask Mr. Jiang: "What's the secret?"

Jiang Jun teased, "Sure enough, speaking of Mr. Zhou, you are finally interested."

Song Boyang: "..."

"Say something quickly, and fart quickly!" Song Boyang raised his eyebrows, "I still have to do the questions."

So Jun Jiang leaned closer to Song Boyang's ear and lowered his voice, "That is to say, Zhou Chiyu has a crush."

"Damn it." Song Boyang asked, "Who is it? Do I know him?"

Jiang Jun shook his head, "I don't know."

Song Boyang narrowed his eyes, "Is your rumor reliable?"

"Reliable." Jiang Jun vowed, "Xia Shitao told me, Xia Shitao said, it was Zhou Chiyu who told her."

"And it's still a single arrow." Jiang Jun, who remembered a certain detail when he was chatting with Xia Shitao, added mysteriously.

"Fuck!" Song Boyang was really shocked, "It turned out to be a single arrow?!"

"But Mr. Zhou is such an excellent person, and his relationship with his crush is a single arrow?" Song Boyang was a little puzzled, "It shouldn't be, who is so ignorant of good and bad?"

.

After a brief break between classes, the second class in the morning came quietly. However, the mental state of the students did not improve much compared to the first class. The classmate is participating in the "Exam King Competition". He didn't sleep at all after class and raced against time to do the questions, so he is yawning crazily now.

It happened that Lao Liu was teaching the genetic knowledge of Biology Compulsory II.

After explaining the example questions in the textbook, he connected with real life examples as usual and asked the students a question.

"Take our accompanying sex as an example, the three different traits of alpha, beta, and omega are controlled by three genes A, B, and O, and the three are alleles for each other. A is completely dominant to B, and O is completely dominant. B is completely dominant to O, then let me test everyone, what is the probability that the child of two parents with alpha gender is omega?"

Song Boyang picked up the pen holder and calculated it underneath. After writing it, he checked the answer with Jiang Jun by the way.

"Has anyone figured it out?" Lao Liu asked everyone with a smile.

There was a voice from below, "One in 36?"

Lao Liu asked with a smile: "Who said one in 36?"

Then the boy who spoke just now was clicked by Lao Liu to answer the question.

Old Liu: "Tell me about your thinking."

Boy: "The father's gene can be AA, AB, AO, and the mother's gene is also the same, so there are a total of nine situations, and they can be calculated separately to know the final result."

"Well, that's pretty good. This is a brute force method." Lao Liu nodded, "Does any student have any other ideas? Do you have a different opinion from this classmate just now?"

There was a lot of chatter below, and the discussion was in full swing, but no one raised their hands.

When Lao Liu saw this, he began to chatter, "Zhou Chiyu, please answer."

Zhou Chiyu stood up and said without hesitation: "A child with the omega trait must have an OO genotype, so only when the parents carry the O gene at the same time, the child can be an omega. The above situation is only possible when the genotype of both is AO."

Lao Liu asked again: "Then do you agree with the 36/[-] that the classmate just said?"

Zhou Chiyu said: "When the ratio of AA, AB, and AO in the crowd is 1:1:1, the result is only one in 36. I think this question needs to consider the proportion of AO in the crowd, but the question does not give out."

Song Boyang looked at the answer on his draft paper and suddenly realized.

"Okay." Lao Liu moved his fingers, "Sit down, all of you."

"Yes. What Zhou Chiyu said is correct. I didn't say the proportion of the various genotypes in the population when the sex is alpha, so there is no answer to this question." Old Liu smiled amiably, as if hiding a knife in his smile , "Then let me add a little information to make this question an answer."

"Suppose it is known that in the population, the gene frequencies of the three genes A, B, and O are 50%, 30%, and 20% respectively. The gene frequencies are in

Chapter 5, we haven’t learned it yet, but let me mention it here first, and make a connection with the knowledge points later. In addition, you may also encounter it when you do the exercises of this chapter after class. "

"Gene frequency refers to the proportion of a certain gene to the total number of alleles in a population gene pool." Lao Liu simply gave an example, "If the gene frequency of A is p, and the gene frequency of a is q, The frequency of AA in the population is p squared, aa is q squared, Aa is 2pq, and so on."

Lao Liu didn't go into too much detail. After all, Class [-], Grade [-] is a key class. He hopes that students can think independently and deeply first, and then listen to him to reveal the answer.

"Come and do the math, what is the answer to that question just now?"

With an order, Song Boyang began to write vigorously.

In the first 10 minutes of this class, Lao Liu took the students through the knowledge points briefly. Some students have not yet woken up, and some students have woken up but their brains are like a ball of paste. Digest what Lao Liu said.

Students who are a little less logical in thinking don't know what they are doing.

Lao Liu started to kill again and ordered several classmates.

Someone said: "One in 25."

Another said: "One fifth."

Finally, Fang Wenze was called.

Fang Wenze stood up and looked down at the draft paper, "One percent."

He seemed a little nervous, his hands holding the draft paper were trembling, his voice trembled faintly, and his complexion was a little pale.

Seeing this, Lao Liu couldn't help asking with concern, "Are you okay? Are you feeling unwell?"

"Thank you...thank you teacher." Fang Wenze said softly, "I'm fine."

"Fang Wenze's answer is correct." Lao Liu picked up a piece of chalk from the chalk box, and drew a crooked form, "Come on, let me draw a form and let you analyze this question."

Old Liu said that the saliva is flying straight. He took the students to sort out the thinking of the question from the beginning to the end. Finally, he asked: "Do you all understand? Is there anything you don't understand?"

Those who understand say they understand, and those who do not understand dare not say anything.

There seemed to be agitation underneath.

"If you don't understand, just tell me. After passing this village, there will be no such shop."

Finally, a hand was tentatively raised.

Old Liu: "Well, what's your question?"

The classmate frowned, and supported his waist with one hand, "Teacher, I don't feel well!"

"Physical discomfort?"

Lao Liu was about to ask, the next second, the four pheromone sirens installed at the four corners suddenly sounded at the same time.

The pheromone alarm is an essential tool for every school with a gender mixed system. It is used to detect whether there is pheromone in a space, in case the pheromone leaked by a classmate unintentionally triggers the passive entry of many students.The estrous period eventually led to chaos and out of control.

The siren is basically infallible, so the pheromone of some students leaked!

But the pheromone alarm is not the best solution after all, because when the pheromone alarm starts to alarm, it means that the pheromone in the classroom has reached a certain concentration.At this time, it was too late to find out the source of the pheromone and send that student to the isolation room.

Lao Liu reacted quickly. He first turned on the air purifier in the classroom, and then used the special teacher key to open the drawer in the compartment of the podium, where many suppression hair were stored.Lao Liu grabbed a handful of love period pills and put them on the desks of the students in the first row. He asked the students to take one each and pass the rest on.

The white pills are sealed one by one in a translucent bag, like milk-flavored candy, with a hint of sweetness in the mouth.

But it is not candy, and it cannot be eaten too much.

As the saying goes, medicine is three-point poison, so even if the current technology has developed to a relatively advanced state, the people who develop the pill are already minimizing the damage caused by the pill to the body of the eater, but they cannot completely eliminate the damage. Elimination, so even this suppressive pill can effectively suppress the active hair.Emotional and passive.Love can only be used as a backup.

Therefore, the use of suppression rings or barrier stickers becomes extremely important.

Seeing that the students basically swallowed the suppressive pills, Lao Liu put the extra pills in the drawer and locked them behind his back, and finally heaved a sigh of relief.

The alarms sounded. It stands to reason that the pheromone concentration should not be low, but why didn't anyone smell it in advance?

After all, Lao Liu taught biology, and he was very sensitive about it, so he figured it out right away——

Most likely, odorless pheromones.

In this battle, no matter how dull the students are, they still know what happened just now. They whispered to each other for a while, and the discussion became more intense.

"Everyone be quiet."

Old Liu spoke up and began to preside over the overall situation.

"The siren rang just now, indicating that a classmate's pheromone leaked." Lao Liu looked solemn, "So, every student must pay attention to their own special period, you know? You see, because of one person's negligence, it brought everyone If you make trouble, you will waste the time of everyone in the class."

Old Liu continued to be serious, "There is no way to suppress the pill, it has a limited inhibitory effect on the active estrus, so that student who accidentally leaked his pheromone, can he take the initiative to go to the isolation room now?"

As soon as the voice fell, the surrounding silence could be heard.

Unexpectedly, no one stood up.

On the contrary, many students looked around, wondering who was responsible for the situation caused by negligence.

But got nothing.

Lao Liu looked around, "I hope you are brave enough to act. Since you have done something wrong, you must have the courage to stand up and take responsibility."

Still no one stood up.

Old Liu laughed angrily, "Since the pheromone alarm has sounded, it means that a classmate has leaked pheromone. The alarm cannot be wrong. Why don't you dare to stand up and bear the consequences?"

"Forget it, you should study hard by yourselves first." Lao Liu gave up asking and stepped off the podium, "I'll contact your class teacher."

Outside the classroom, Lao Liu stood outside the corridor and began to make a phone call.

In the classroom, the students were already discussing, "Did someone leak pheromone?"

Some students suddenly realized, "No wonder I felt unwell before!"

Some students complained, "Why can't I learn to use barrier stickers and restraining rings well in my second year of high school?"

Some students asked, "But why didn't I smell it? Is it because I'm far away?"

"Hey, didn't you smell it? I didn't smell it either?!"

"I do not have either!"

"Is it because of the odorless pheromone?"

"It should be! No wonder I didn't smell it!"

"Don't you pay attention when you know that you are an odorless pheromone? Really."