Well, it s still a creature. The concept of heredity and variation is completely understood

1. If the parents with the same trait are crossed, and the offspring have trait separation (i.e., new traits), the traits of the parents are dominant (only the crossing of AA and AA can have the phenomenon of trait separation, so that A can be judged to be dominant; The new trait will not appear in the hybrid offspring of AA and AA).

2. The hybridization of individuals with different traits can have AA and AA hybridization, as well as AA and AA, and only the hybrid offspring of AA and AA have only one trait, which can judge A as dominant.

Heritable variation is one that is caused by changes in the genetic material (mainly DNA) and can be passed on to future generations. For example, the coat color of the dog is different, and the goldfish is artificially selected by the crucian carp, and there is no watermelon.

changes in the number of chromosomes), albinism.

Hemophilia (genetic changes).

Non-hereditary variation refers to those that are caused by environmental factors and cannot be passed on to future generations without changes in genetic material. For example, in the field of the best black, the wheat planted on the fertile land grows vigorously.

According to the biological individual, it can be divided into favorable variants (such as dwarf mutations in wheat) and unfavorable variants (e.g., albino seedlings in wheat).

Heredity and variation are one of the fundamental characteristics of living things. It is a discipline that studies the structure and function of genes, as well as their variation, transmission and expression.

Genetics - the science of studying the heredity and variation of organisms, the study of the structure, function and variation, transmission and expression of genes. The concept of parent-child in genetics is not limited to parents and children or a family, but can also be extended to include a group of many families, which is the object of study in population genetics.

Genes are found in the nucleus, chromosomes, DNA of living things. Chromosomes appear in pairs, so DNA, genes all come in pairs. Normally, there are 23 pairs of chromosomes, 46 DNA molecules, and an infinite number of genes (there are countless genes in one DNA).

The research scope of genetics includes three aspects: the nature of genetic material, the transmission of genetic material and the realization of genetic information. The transmission of genetic material includes the duplication of genetic material, the behavior of chromosomes, the laws of heredity, and the quantitative changes of genes in a population. The purpose of modern genetics is to seek to understand the underlying mechanisms of the entire genetic process.

Heredity and variation are phenomena that are constantly and universally occurring in the biological world, and they are also the basis for speciation and biological evolution.

Heredity and variation in living things are achieved through reproduction and development. There are always more or less differences between the parents and offspring of an organism and between the offspring of the individual, which is the phenomenon of biological variation. Some variations in living things are heritable and some are not.

Heritable variation refers to the variation that an organism can pass on to its offspring, including genetic recombination, genetic mutation, and chromosomal variation. This variation is caused by changes in the genetic material. Non-heritable variations are those caused by external factors such as light, water, etc., and will not be passed on to future generations.

Basic concepts of heredity and variation.

The phenomenon in which the parents of an organism can produce offspring similar to their own is called heredity. The basis of genetic material is deoxyribonucleic acid (DNA), and parents pass on their own genetic material DNA to their offspring, and the inherited traits and species remain relatively stable. The reason why life can continue from generation to generation is mainly due to the fact that the genetic material is passed down from generation to generation in the course of biological processes, so that the offspring have traits similar to those of the previous generation.

However, there is absolutely no exact same between parents and offspring, and between individuals of offspring, that is, there are always more or less differences, and this phenomenon is called variation. Heredity refers to the similarity between parents and children, and variation refers to differences between parents and children and between offspring. The heredity and variation of living things is achieved through reproduction and development.

Heredity and variation are opposites, heredity keeps species going, and variation keeps species evolving.