Genetics
There are plenty of reasons how dinosaurs evolved in the first place. One of the main reasons suggested by Charles Darwin is natural selection, which is considered to be a big factor in the diversity of species and their genomes. It states that all species have the motive to reproduce and survive, passing their genetic information on the way. However, as more species produce more offspring than the environment can support, competition increases as a result, organisms that are more suited for their environment tend to survive, while those who aren't weeds out. As a result of this, Darwin believes that organisms evolved to suit their environment. This is also one of the reasons as to how a certain species evolved to become dinosaurs. Many of the dinosaurs evolved from a family of primitive reptiles known as Archosaurs ("ruling lizards"). However, these lizards were much smaller than the dinosaurs.
During the Triassic period, some reptiles species have envinced a confusing mixture of Archosaur and dinosaur characteristics. For example, the two-legged Marasuchus looked remarkably similar to an early Theropod dinosaur, and along with a genera like Saltopus and Procompsognathus. During the Devonian Period, some animals moved from land to water because many food resources on land had not been exploited. Early amphibians (Ichthyostega and Acanthostega) were probably closely related to the Panderichthys (the lobe fish that developed the first limbs). In the Triassic Period, the earth's continental blocks joined together, forming a supercontinent known as Pangaea. In early Triassic period, Archosaurs, the immediate ancestors of the dinosaurs, dominated land ecosystems. By the Late Triassic Period, Archosaurs diversified rapidly, resulting the creation of the first dinosaurs. These dinosaurs quickly took advantage of the habitats that were left by the early extincted species and expanded their populations. Environmental changes also affected other reptiles more than the dinosaurs.
Genetic mutation is another important reason to the evolution of dinosaurs and other animals in general. The DNA codes in individuals of the same species are very similar and only differ in about one out of 1000 nucleotides. Each change in the amino acid sequences forms a mutation that may bring a advantage, disadvantage, or neutral affect to the population. After generations, genes that don't bring any benefits would gradually not be passed on as the coding for these genes would stop. In contrast, beneficial genes pass on to increase the chances of survival. Novel changes in which some mutations generate are the starting points of evolution of a species when they become too diverse. Mutations in Archosaurs is one of the main reasons in the birth and evolution of dinosaurs.
The Modern Synthesis is a theory about evolution that discusses about how evolution works at the level of genes, phenotypes, and populations. It recognizes that there are a couple of mechanisms of evolution for dinosaurs other than natural selection. One important mechanism is random genetic drift, which is the change of an allele frequency in a population due to random sampling. Another reason for evolution is gene frequency: with natural selection occurring in all species, it became a process that altered gene frequency. Gene flow is the immigration and emigration of species from one population to another, creating more different genetic combinations. With the changes in genetic frequency caused by random genetic drift, gene flow, and of course natural selection, dinosaur evolved into the world.
Sexual Reproduction is another reason for evolution and how dinosaurs evolved in the first place. It increases genetic variation in the offspring by forming new combinations in the DNA, which results in genetic variability in the species. As the genetic variability in one species increases from sexual reproduction, it evolves into a new species. As numerous generations passed, species eventually became so distantly related that they can't reproduce with each other anymore. As a result, a new/separate kind of species is formed.
There are plenty of reasons how dinosaurs evolved in the first place. One of the main reasons suggested by Charles Darwin is natural selection, which is considered to be a big factor in the diversity of species and their genomes. It states that all species have the motive to reproduce and survive, passing their genetic information on the way. However, as more species produce more offspring than the environment can support, competition increases as a result, organisms that are more suited for their environment tend to survive, while those who aren't weeds out. As a result of this, Darwin believes that organisms evolved to suit their environment. This is also one of the reasons as to how a certain species evolved to become dinosaurs. Many of the dinosaurs evolved from a family of primitive reptiles known as Archosaurs ("ruling lizards"). However, these lizards were much smaller than the dinosaurs.
During the Triassic period, some reptiles species have envinced a confusing mixture of Archosaur and dinosaur characteristics. For example, the two-legged Marasuchus looked remarkably similar to an early Theropod dinosaur, and along with a genera like Saltopus and Procompsognathus. During the Devonian Period, some animals moved from land to water because many food resources on land had not been exploited. Early amphibians (Ichthyostega and Acanthostega) were probably closely related to the Panderichthys (the lobe fish that developed the first limbs). In the Triassic Period, the earth's continental blocks joined together, forming a supercontinent known as Pangaea. In early Triassic period, Archosaurs, the immediate ancestors of the dinosaurs, dominated land ecosystems. By the Late Triassic Period, Archosaurs diversified rapidly, resulting the creation of the first dinosaurs. These dinosaurs quickly took advantage of the habitats that were left by the early extincted species and expanded their populations. Environmental changes also affected other reptiles more than the dinosaurs.
Genetic mutation is another important reason to the evolution of dinosaurs and other animals in general. The DNA codes in individuals of the same species are very similar and only differ in about one out of 1000 nucleotides. Each change in the amino acid sequences forms a mutation that may bring a advantage, disadvantage, or neutral affect to the population. After generations, genes that don't bring any benefits would gradually not be passed on as the coding for these genes would stop. In contrast, beneficial genes pass on to increase the chances of survival. Novel changes in which some mutations generate are the starting points of evolution of a species when they become too diverse. Mutations in Archosaurs is one of the main reasons in the birth and evolution of dinosaurs.
The Modern Synthesis is a theory about evolution that discusses about how evolution works at the level of genes, phenotypes, and populations. It recognizes that there are a couple of mechanisms of evolution for dinosaurs other than natural selection. One important mechanism is random genetic drift, which is the change of an allele frequency in a population due to random sampling. Another reason for evolution is gene frequency: with natural selection occurring in all species, it became a process that altered gene frequency. Gene flow is the immigration and emigration of species from one population to another, creating more different genetic combinations. With the changes in genetic frequency caused by random genetic drift, gene flow, and of course natural selection, dinosaur evolved into the world.
Sexual Reproduction is another reason for evolution and how dinosaurs evolved in the first place. It increases genetic variation in the offspring by forming new combinations in the DNA, which results in genetic variability in the species. As the genetic variability in one species increases from sexual reproduction, it evolves into a new species. As numerous generations passed, species eventually became so distantly related that they can't reproduce with each other anymore. As a result, a new/separate kind of species is formed.