The Path to the Chromosome Theory of Heredity

The pathway of genetic chromosome theory The concept of pathogenetic chromosome theory is very important in understanding evolution and genetics. There are many ideas to influence the revolutionary discovery of chromosome inheritance, some are correct, some are not right. The main reasons for chromosome theory are the hypothesis hypothesis, germplasmic theory and Mendel's law. Pangenesis Lamarck describes the idea that by simply using or not using specific organs they grow and contract, then their descendants may inherit these acquired characteristics It was.

There are two types of inheritance: biological and social. Biological inheritance includes all physiological and psychological features that a person is inherited from a parent through genes in the chromosome. Social inheritance refers to everything a generation derives from future generations in the form of social customs, traditions, ideals, values, beliefs, ethics, customs, and skills. When each generation hands these acquired skills and knowledge to future generations, it constitutes a social heritage.

Genetics is the transmission of biological properties from one generation to the next. Genetics is located in the nucleus with a structure called chromosome. Chromosomes have small units called genes containing genetic code. Each creature duplicates its own species or species, most of which are genetically structured. Even before a written history begins, people understand some ways of genetics. Today's livestock and plants prove this. Today's domestic horses, cows, dogs, corn, wheat, and cotton are very different from the original wild ancestors. They are the product of ancient breeder art, including the right choice of parents, well-controlled breeding, and careful selection of the best descendants for further breeding.

Chromosomes are first named by cytologists through the microscope to observe cells during cell division. The current definition of chromosomes now includes the function of genetic and chemical elements. A chromosome is a DNA molecule that carries all or part of the genetic information of an organism. In eukaryotic cells, DNA is packaged together with proteins in the nucleus, and the structure and appearance are different in different parts of the cell cycle. When completely degraded chromatin is observed by electron microscopy, DNA is packaged with histones to form nucleosomes. During mitosis or meiosis, chromatin can become intertwined with higher order fibers and completely aggregated chromosomes by light microscopy. A diagram from https://www.genome.gov/Glossary/index.cfm?id=32