Chapter 168

In the greenhouse, the growing peas bear a little bit of dew, and the fog in the early morning has not yet cleared. Lena and several students have come here to check the situation of the third generation peas.

They first came to the seventh field, which is larger than the others. Peas are growing in the fields and are thriving.

"Ah..."

the first time she saw this field, Dana let out a small exclamation.

"Sure enough, there are both high stemmed peas and low stemmed peas."

Charlotte nodded. In the field in front of her, the pea seeds with the same color and high stem had two completely different characters.

"Traits that didn't appear in the previous generation appear in this generation. In this way, blood factors are not fusion or assimilation, but exist at the same time."

Fina said to herself that the current experimental phenomenon clearly verifies the previous hypothesis, and the different blood factors inherited from her parents are clearly shown in the next generation.

"In this way, the blood factor of high stem is indeed stronger than that of low stem. If the two blood factors are combined, pea will show a stronger character, but the weak blood factor has not disappeared. If it continues to be inherited, the weak blood factor may reappear."

Charlotte concluded with some understanding.

"We might as well count the number of high and low stemmed peas in this field. Maybe we can get further information."

Lena didn't say it directly, but reminded in this way.

"It makes sense."

Phina nodded and said nothing more. Instead, she went to one side and began to count.

In less than half an hour, they gathered together.

"The number of high stem peas is 167, the number of low stem peas is 56... The number of high stem peas is much more."

Dana said softly, looking at the record on the paper.

"The ratio of these two types is close to three to one. It seems that there is some rule in them..."

fina said faintly, but she had already started to calculate in her brain.

Subconsciously, she put her finger on her lips and thought. Her rimless glasses reflected the ambiguous sunlight from the greenhouse dome. Then, as a result, fina came back to the desk and began to write with her pen.

"If we assume that the blood factor of high stemmed pea is a, and that of low stemmed pea is a, then the pure high stemmed pea should be AA. Similarly, the pure low stemmed pea should be AA, and the second generation of hybrid pea is AA."

She used ancient runes to represent dominant and recessive blood factors.

"According to the results of the experiment, as long as there is a blood factor in pea, it will show the characteristics of high stem, while AA and AA have no difference in appearance, only AA type pea will show the characteristics of low stem."

"In this case, the blood factor type of the third generation obtained from the self pollination of the second generation of AA peas, er, according to the permutation and combination..."

Dana also wanted to try her best to express herself, but she was a little stuck in the calculation.

"AA, two kinds of AA, AA, four kinds of arrangement, the final ratio of characters is exactly three to one."

Charlotte quickly answered the question for Charlotte.

"So, back to the topic we wanted to discuss at the beginning, the traits that did not appear in the parents may appear in the offspring, and the traits that existed in the parents may not exist in the offspring. The present experimental results can fully demonstrate this conjecture."

Lena smiles and concludes that he got the answer when he saw the condition of the plants in the field. At this time, he just repeats it in a language that students can understand.

"What we can get now is that blood factors control the external performance of species. Blood factors exist in pairs, and there is a difference between dominant and recessive. When two kinds of blood factors exist, species will show dominant characteristics. At the same time, when blood factors are passed on to the next generation, they will be randomly and freely allocated and combined, which can be used to separate dominant and recessive blood factors "Pulse factor."

In fact, the dwarf pea in this field is the purebred of AA type, and the high stem pea can be selected after the next planting. This method is much better and faster than the previous method of breeding purebred peas that will not produce other traits.

We should know that it takes a long time to cultivate purebred, especially dominant purebred, without any theoretical support, and the efficiency is very low.

"Let's look at field eight again."

Field 8 also has high stem peas and low stem peas, but in addition, Lena has another treatment for the peas in this field. The peas here have both smooth and wrinkled surfaces.

"Here is the third generation of peas that I got by crossing the peas with high stem and smooth surface and the peas with low stem and wrinkled surface. All the peas of the second generation are high stem and smooth surface. According to the previous theory, smooth surface is the dominant blood factor relative to wrinkled surface."Lena asked the three students to count the plants in this field. This time, it took more time to check the peas. It took them an hour and a half to get the final result.

"192 peas with high stem and smooth surface, 63 peas with high stem and wrinkled surface, 64 peas with low stem and smooth surface, 22 peas with low stem and wrinkled surface... The proportion of peas with four traits is close to 9:3:3:1..."

Xia Luo calculated that the three of them soon began to calculate on paper, trying to analyze the reasons for this phenomenon.

About ten minutes later, fina was the first to get the answer.

"To classify these plants, the ratio of high stem to low stem is three to one, and the ratio of smooth surface to wrinkled surface is also three to one. In terms of individual characters, the proportion of original separation is still maintained. The current distribution is actually the result of free combination of the two characters!"

"... this shows that the inheritance of high stem and low stem, smooth surface and wrinkled surface is independent of each other. Peas with high stem and smooth surface may appear peas with low stem and wrinkled surface, which is completely different from the previous generation."

Charlotte nodded and continued.

"By analogy, if there are three, four, and more kinds of traits, there may be similar results. If all the external manifestations of the species are controlled by blood factors, then the situation of children and parents will be completely different!"

This is exactly what happened to alimia!

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