Do traits acted upon by sexual selection have anything to do with fitness?
Maybe, maybe not. Hopefully (hope, as in for the survival of the species) the species can both evolve traits that make it more suitable for a mate and evolve traits that will increase fitness. But this isn't always the case. Take the peacock for example. That huge tail is a beacon for predators, yet the bigger the better for mating. Because peacocks continue to have these huge tails, we can only conclude that its benefits in attracting a mate has outweighed any negative predatory effects.
Other times, the traits acquired as a result of sex selection have no effect on relative fitness; rarely beneficial.
Can the trait of rate of development be acted upon by natural selection?
Yes, the rate of development can be influenced by natural selection. Traits that affect an organism's development can impact its survival and reproduction, thereby subjecting them to selection pressures that may favor certain rates of development over others. Over multiple generations, individuals with beneficial rates of development may be more likely to pass on their genes, leading to evolutionary changes in development rates within a population.
What structure is formed when fertilization occurs?
When fertilization occurs, a structure called a zygote is formed. This is a single cell with a full set of chromosomes, resulting from the merging of the egg and sperm. The zygote will eventually divide and develop into a new organism.
Is acquired characteristics important to the theory of evolution?
Yes! The theory of Evolution shows that a species will thrive if it has favorable characteristics.
A simple way of explaining it is this: Say that when humans are still in the trees, one pregnant mother is hit by a stray photon of radiation (OK I'm dumbing it down here) and her child is mutated. The child has received the 'Sleepy Smoker Gene' (OK I'm REALLY dumbing it down here. This gene may consist of nicotine sensitivity and associated drowsiness but you get the idea).
This isn't very important at the time as nobody smokes, but fast forward to 2010. Say that the sleepy smoker gene has been inherited by every 1 in 1000 people because they are descendants of this mother primate. Now, smoking is popular and more people are likely to fall asleep while smoking. These people may eventually die off and the more favourable genes in the human race will replace them. The sleepy smoker gene will disappear into obscurity and no more people will fall asleep and die while smoking.
What are the chances of life occurring in the universe?
The chances (the probability) of life occurring in the universe is 1. We are alive, therefore life has occurred in the universe.
There is also a 99.999999999% certainty that life exists elsewhere in the universe, because there are roughly dozens of planets in billions of solar systems in billions of galaxies.
Adaptations of species are determined by the genes contained in the DNA code?
Yes, adaptations in species are a result of genetic variations that occur naturally through mutations and genetic recombination. These genetic changes provide individuals with traits that can better suit them to their environment, leading to increased survival and reproduction rates, and ultimately shaping the evolution of the species.
What is the fitness of an organism?
Fitness of an organism refers to its ability to survive and reproduce in a given environment. Organisms with higher fitness are better adapted to their environment, allowing them to produce more offspring with advantageous traits that increase their chances of survival. Fitness is a key concept in evolutionary biology, as it determines the success and persistence of individuals in a population over time.
How paleontologist support Charles Darwin idea?
Paleontologists finding of fossils clearly shows the link between species as they adapt and change over hundreds of millions of years. Literally a timeline of the structure of animals to what present day species looks like
The evolution of the plant kingdom can be inferred by studying?
The evolution of the plant kingdom can be inferred by studying plant fossils, comparative morphology of plants, genetic relationships among plant species, and ecological adaptations of different plant groups. These sources provide insight into the diversification, development, and relationships among plant species over time.
How are structural similarities of animals used as evidence for evolution?
The following image they provide from Encyclopedia Brittanica helps detail the physical similarities in the skulls between different species of primates:
As you can see, the construction of these different skulls do vary, but are mostly similar in overall shape, and even demonstrate a gradual change over millions of years. While this evidence doesn't outright prove The Theory of Evolution, it does provide much-needed context to convince those who are too stubborn to accept that we are distant cousins with many of today's primate species (and all life on earth, as it began with one single-celled organism at least 3.7 billion years ago).
When was evolution hypothesized?
The changing of life over time was first proposed by Greek philosophers ca. 600BCE (Anaximander, Empedocles). Similar hypotheses have been proposed between then and the 18th century CE, but it was not until the 18th century that such proposals became the subject of critical thought and empirical research. Diderot and Buffon were French philosophers who proposed hypotheses similar to common descent and natural selection back in the 18th century. It was also in the 18th century that natural philosophers first began structured investigation of the fossil record, and that the thought that life changes over time became firmly embedded in natural philosophy. Before Darwin prominent names in the history of evolutionary thought are: Lamarck, Grant, Saint-Hilaire. Robert Chambers first proposed a form of common descent - though one in which all other animals were steps on a ladder leading towards modern man. It was not until Charles Darwin that universal common descent, the 'tree of life' view, was formally proposed.
Does evolution violate the Second Law of Thermodynamics?
No, evolution does not violate the Second Law of Thermodynamics.
No life disobeys the Second Law. Zygotes become embryos, embryos become foetuses, foetuses become babies, then children, then adults. All zygote-to-adult growth fails to disobey the Second Law. There is a constant influx of energy into the growing individuals through nutrition. All life carries out nutrition. There is always energy available for growth and reproduction and if there is enough energy for that, then there is enough energy for change/evolution. In this sense, Law-disobeying complexity is not added, from prokaryote to eukaryote or even from bacterium to human. It is simply growth from neonate-form to adult and there is certainly enough energy for that.
Explain the evidence of evolution presented by the mammals of Australia?
The evolutionary evidence presented by mammals in Australia includes unique marsupial mammals like kangaroos, koalas, and wallabies, which are endemic to the continent. The presence of prehistoric marsupial fossils in Australia supports the idea of an ancient lineage of mammals distinct from placental mammals found elsewhere. The diversity and adaptations of Australian mammals, such as the egg-laying monotremes like the platypus and echidna, further highlight the evolutionary history of mammals in Australia.
Does natural selection take place without human control?
yes natural selection takes place without human control. In natural selection it is the environment selecting the traits/alleles. However there is something called artificial selection which is evident in dog breeding. In that case humans select for the traits. Artificial selection can have detrimental effects on a population though. Some dogs have been selected for being very small and having a flat nose. These dogs are so small now that they cannot give birth naturally and have no use of their nasal passages
What is The theory that most new species form when small populations became isolated?
The theory you are referring to is called allopatric speciation. It suggests that new species can evolve when a population becomes geographically isolated, leading to genetic divergence and eventually the formation of distinct species.
A change in allele frequencies due to migration?
Migration can lead to changes in allele frequencies by introducing new alleles into a population. When individuals move between populations, they bring their genetic material with them, potentially altering the genetic diversity of the receiving population. Gene flow through migration can increase genetic variation within a population or decrease differences between populations.
How is successful reproduction important to the theory of natural selection?
Successful reproduction is critical in the theory of natural selection because it is through reproduction that traits are passed on to offspring. Individuals with traits that offer advantages in survival and reproduction are more likely to pass those traits to the next generation, thus increasing their frequency in the population over time. This process drives the adaptation of species to their environment through the selection of beneficial traits.
Why is mutation in and of itself not evolution?
A mutation changes the DNA of an organism in a way that affects its offspring, either immediately or several generations down the line.
The change brought about by a mutation is either beneficial, harmful or neutral.
If the change is harmful, then it is unlikely that the offspring will survive to reproduce, so the mutation dies out and goes nowhere.
If the change is beneficial, which is a rare occurrence, then it is likely that the offspring will do better than other offspring and so will reproduce more.
Once the mutation has manifested itself for the better in the offspring, through natural selection the offspring will mate more and create a new generation with the same manifested mutation. Only at this point can we say that the species has evolved since not all mutations are fruitful and create a new generation with better or different characteristics. In fact most mutations are harmful and thus do not evolve which is why the process of evolution is very slow.
What traits that are controlled by more than 1 gene?
Breathing, for one. Mindfulness is another. Respiration is the best example of this when it is considered to be a single trait.
There are many less complex instances, yet all are 'highly biochemically involved'.
The discovery of DNA and the ability to study genetic sequences have provided strong evidence supporting evolution by showing similarities in DNA among different species, indicating a common ancestry. This molecular evidence was not available to Darwin and has since reinforced the theory of evolution.
Their survival is dependent on their ability to compete for resources like food and mates, evade predators, and adapt to environmental changes. Only individuals with advantageous traits that improve their chances of survival and reproduction will pass on their genes to future generations.
When we trace evolutionary history we find that the earliest limbs were the fins of fishes, which became sturdier when fish started to colonize the land, and which then adapted to various ecological niches in the form of a bird's wings, a cat's paws, and a dolphin's fins. Evolution is economical in nature, it always seems to prefer to modify an existing structure rather than creating something entirely new. This is quite understandable in terms of natural selection. Existing strucures will appear in various forms because not all individuals of a given species are exactly the same, and the form that best suits some ecological niche is going to be selected. This makes possible gradual change.
There is no sugar in DNA. DNA is made up of nucleotides, which consist of a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base.
This type of evolution is known as allopatric speciation, where populations of a species become isolated geographically and evolve independently due to different environmental pressures. Over time, these populations may become distinct species with unique traits and adaptations.