What it means to be stable heredity biological 40

The stable inheritance of relative traits is that the parents are inbred, and there will be no trait separation, and the traits of the female parent will be passed on to the offspring, which generally refers to homozygous. Since heterozygotes have more than one allele, trait segregation occurs during inheritance, and traits cannot be stably inherited from the parent. The occurrence of stable inheritance is that the F2 generation produces the same genotype as the parent, this phenomenon is called stable inheritance, for example, the parents are AAB and AAB, and the stable inheritance phenomenon is produced in the F2 generation (and the genotype of AAB and AABB appears), the probability of stable inheritance for this phenomenon is 1 8, where the genotype produced by the F2 generation is AAB and the phenomenon of AABB is not called stable inheritance (the genotype of the second generation is different from the parent) but AABB, AABB, AABB, These four genotypes of AABB can be inherited stably when they are used as parents.

Note: Stable inheritance holds true for homozygotes, not for heterozygotes.

If there is no trait separation, it is purebred.

The genes are pure and fertile.

This means that the tissue structure of the species does not change significantly for a long time.

Species can survive without extinction Ice maintains the genetic identity of the species.

Self-inbred does not have trait separation, that is, it is homozygous.

It means the continuation of living beings ...

Stable inheritance means that the offspring do not have trait separation. Only the genes of the parental self-bred can be stabbed in the inheritance.

Stable inheritance occurs that the F2 generation produces the same genotype as the parent, this phenomenon is called stable inheritance, for example, the parents are AAB and AABB, and the stable inheritance phenomenon is produced in the F2 generation (and the genotypes of AABB and AABB appear).

For this phenomenon, the probability of stable inheritance is 1 8, in which the phenomenon of AAB and AABB genotype produced by F2 generation is not called stable inheritance (the genotype of the second generation is different from that of the parent), but the stable inheritance phenomenon can occur when the four genotypes of AABB, AABB, AABB and AABB are used as parents.

Stable inheritance means that the parents are inbred, and there will be no trait separation, and the traits of the parents will definitely be passed on to the offspring. Generally refers to homozygous. Stable inheritance is true for homozygotes, but generally not for heterozygotes.

The parents are AAB and AABB, and the stable inheritance phenomenon is produced in the F2 generation (and the genotype of AAB and AABB appears), and the probability of stable inheritance is 1 8 for this phenomenon, wherein the genotype produced by the F2 generation is AAB and the phenomenon of AABB is not called stable inheritance (the genotype of the second generation is different from that of the parent), but the four genotypes of AABB, AABB, AABB, and AABB can occur when they are used as parents.

is homozygous.

The ratio of yyrr to yyrr in f1 is derived from 1:2, so the ratio of yyrr in yellow round grains is 1/3, and the ratio of yyrr is 2/3

The green wrinkles, i.e., Yyrr, do not produce homozygotes when hybridized with Yyrr, and the proportion of hybrids with Yyrr produces homozygotes is 1/4

So the total ratio is 1/3 x 0 + 2/3 x 1/4, which is 1/6

Refers to the genotype being pure and sum. For example, aabb, aabb, aabb. There will be no trait separation.

Stable inheritance here refers to the genotype as: yyrr, yyrr

First, the bases are strictly complementary pairing. That is, incorrect bases are difficult to pair. Because the unpaired bases cannot form a stable structure of hydrogen bonds.

In the process of DNA replication, DNA polymerase also has an activity, that is, it will excise the incorrectly paired base sequence. This further guarantees correctness.

During the time that the DNA does not replicate, most of the DNA maintains a highly restrictive double helix structure as well as a higher order structure. Because of the strict structure, it is difficult to react with other substances, so it is very stable.

Moreover, there are many DNA repair mechanisms in the cell, and once the DNA is wrong, it will be removed or corrected back.

The principle of complementary base pairing and the stable hydrogen bond and helical structure between DNA molecules.

The organism comes from the body to ensure its own stability.

Mechanism of transmission: The molecule is made up of two chains.

2.There are hydrogen bonds between the base pairs.

3.The base pairs are located on the outside of the scaffold composed of phosphoric acid and deoxyribose, and there is a protein encapsulation.

Multi-point replication and replication while unspiraling are used to ensure that replication is completed in a short time and to avoid gene mutations.

6.Semi-reserved replication and strict base complementarity pairing ensure precise replication.

Self-repair function.

The key to the stable inheritance of the gene of interest is to detect the construction of gene expression vectors. Obviously, in practical applications, only those GMOs that express the gene of interest at a sufficiently high level are meaningful.

If the segregation ratio of transgenic offspring does not conform to Mendelian inheritance, the transferred exogenous genes may interfere with the expression of endogenous genes. Another reason is the integration of two or more transgenic copies at different loci in the recipient genome. These are confirmed by breeding trials.