Act 164. The laws of heredity

In the greenhouse, the thriving peas are showing a little dew, and before the morning fog has cleared, Reiner and a few students have already arrived here to check on the third generation of peas.

They first came to Field No. 7, which was larger than the others, and dense peas thrived in the field.

"Ah......h

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

"Sure enough, there are both tall and short peas."

Xia Luo nodded, and the field in front of her, planted from the seeds of the tall-stemmed peas, had two completely different traits.

"Traits that did not appear in the previous generation have appeared in this generation, so that the blood factors are not fused or assimilated, but exist at the same time."

Fina said to herself, the experimental phenomenon in front of her clearly verified the previous hypothesis, and the different blood factors inherited from her parents were clearly expressed in the next generation.

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

Xia Luo concluded with understanding.

"We might as well count the number of tall and short pea plants in this field, and maybe we can get further information."

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

"Makes sense."

Fina nodded, didn't say anything more, but walked to the side and began to count.

The three of them dispersed, each counting the types of plants in an area, and in less than half an hour, they were all together.

"The number of tall pea plants is one hundred and sixty-seven, and the number of dwarf pea plants is fifty-six...... The number of tall stemmed peas is significantly higher. ”

Dana looked at the notes on the paper and whispered.

"The ratio of these two types is close to three to one, and there seems to be some pattern in it......"

Fina said lightly, but the calculation had already begun in her mind.

She subconsciously put her finger to her lips in thought, her rimless glasses reflecting the ambiguous sunlight obscured by the greenhouse dome, and then, as if suddenly realizing, Fina hurried back to the table and began to write with her pen.

"If we assume that the blood factor of the tall stem pea is A, and the blood factor of the short stem pea is a, then the purebred high stem pea should be AA, and similarly, the purebred short stem pea should be aa, and the second generation of peas crossed between the two is Aa."

She uses ancient runes to represent both explicit and recessive bloodline factors.

"According to the results of the experiment, as long as there is a blood factor of A in the pea, then it will definitely show the characteristics of a tall stem, while AA and Aa are no different in appearance, only the aa type of pea will show the characteristics of a short stem."

"In this case, the self-pollination of the peas of the second generation Aa type gives the blood factor type of the third generation, uh, according to the permutation......"

Dana also tried her best to express herself, but she was a little stuck in her calculations.

"AA, two kinds of Aa, aa, four arrangements, the final ratio of traits is exactly three to one."

Xia Luo quickly answered this question for Xia Luo.

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

Reiner smiled and concluded that he had already had the answer when he saw the condition of the plants in the field, and that he had just repeated it in a language that the students could understand.

"Now what we can get is that the bloodline factor controls the external performance of the species, the bloodline factor exists in pairs, there is a difference between dominant and recessive, when both bloodline factors exist, the species will show dominant characteristics, and at the same time, when the bloodline factor is passed on to the next generation, it will be randomly and freely assigned to the combination, which can be used to separate the dominant and recessive bloodline factors."

The dwarf peas that appear in this field are actually pure breeds of the AA type, and the tall peas can also be selected for pure seeds after the next planting, which is much more clever and faster than the past means of breeding pure breeds that do not derive other traits.

It is important to know that the cultivation of purebreds, especially dominant thoroughbreds, without any theoretical support, takes a long time and is very inefficient.

"Let's take a look at the situation in Field No. 8."

Reiner added that Field 8 also had tall and short peas, but in addition to that, Reiner had done another treatment for the peas in this field, which had both smooth and wrinkled surfaces.

"Here is the third generation of the second generation of peas that I obtained by crossing peas with the smooth surface of the tall stem and the peas on the folded surface of the short stem, and then self-crossed, the second generation of peas are all high stem smooth surface, to apply the previous theory, the smooth surface is the dominant blood factor relative to the folded surface."

Reiner asked the three students to count the condition of the plants in the field, and this time it took even longer to see the condition of the pea kernels, a full hour and a half before they got the final result.

"One hundred and ninety-two peas with smooth surface of tall stems, sixty-three with folded surface of high stems, sixty-four with smooth surface of short stems, and twenty-two with folded surface of short stems...... The pea ratio of the four traits was close to 9:3:3:1......"

Xia Luo calculated, and the three of them quickly began to calculate on paper, trying to analyze the cause of this phenomenon.

After about ten minutes, Fina was the first to get the answer.

"Classifying these plants, the ratio of tall stems to short stems is three to one, and the ratio of smooth surface to folded surface is also three to one, in terms of individual traits, the original separation ratio is still maintained, and the current distribution is actually the result of the free combination of the two traits!"

“...... This shows that the inheritance of tall stems and short stems, smooth surfaces and folded surfaces is independent of each other and does not affect each other, and peas with smooth surfaces with high stems may have peas with wrinkled surfaces of short stems, which are completely different from the previous generation. ”

Xia Luo nodded, and continued.

"And so on, if there are three, four, or more kinds of traits, it is possible to have similar results, and if all the external manifestations of the species are controlled by blood factors, then there will be a situation where the children are completely different from the parents!"

That's exactly what happened to Elemia!

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