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How does the environment affect the evolution of a species?

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Farheen Khalid

on 16 June 2015

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Transcript of How does the environment affect the evolution of a species?

How does the environment affect the evolution of a species?
The environment affects the evolution of a species because the changes in the environment pressure a species to adapt to the changes. Natural selection works on mutations within the population of the species to bring about the adaptation

Why do some offspring survive and others don’t in a changing ecosystem?
Some offspring survive in a changing ecosystem because they might have already adapted to changing to different environments. Other newly develepoed offspring may not survive because the circumstances they are under may be too extreme for what they can handle.

What is the effect of a changing climate on organisms and their evolution?
If the environment changes, some organisms will have characteristics that make them better able to cope than others, and these individuals will be more likely to pass on their genes to future generations.
- How can population growth be connected to evolution?
Population growth is connected to evolution because without the population growing, there would be no proof that there are species that are evolving.
 How do the four factors of biological evolution work together for a species to evolve? Apply the four factors of biological evolution to a species. 
o Genetic Variation- Individuals in a species vary from one to another. The characteristics have to passed on from one to another.

o Overproduction of offspring – Individuals tend to produce more offspring than the ones can survive which many die and only a few survive.

o Struggle for existence – Excess of production. Competition for food, space and mates as well.

o Differential Survival and Reproduction- This is the continuation for the Struggle for existence where such as hummingbirds with short bills won’t survive so the ones with long bills tend to live. Bill length is determined by the genetics from the parents

What role do mutations play in genetic variability? Why is genetic variability an essential component of natural selection / evolution?
Mutations that occur in reproductive cells are passed onto their next generation are the only kind that contribute to genetic variability in a population. Genetic Variability is vital as a component of natural selection because there is the survival of the fittest among the members in the same species. Some species will produce more offspring than others.

How do mutations and environment drive evolution? (how point mutations; frameshift and substitution would drive evolution)
Mutations and the environment drive evolution because there the environment is constantly changing so it either eliminates those species that cant tolerate the conditions, or it makes a species stronger to survive. Frameshift and Substitution mutations also drive evolution because

How do genetics and the environment work together for the survival of a species?
Genes allows some individuals to have better traits for survival than others. The environment can make one of those traits better than another, so the individual with the desirable trait will be more likely to pass on it's genes.
How is it that there are millions of different species on earth today yet all species descended from a common ancestor?
The environment and mutations are both big factors of the fact that there are millions of different species on earth but all descended from a common ancestor. The environment constantly has changed overtime and mutations cause a species to become slightly different than the rest. Having these two factors, it makes sense how all these different speices have developed since day 1.

Biology Final Project
By: Farheen Khalid
Genetics cont.
How does DNA reveal information and evidence of evolution?
DNA can reveal info and evidence of evolution by finding the "spelling errors" in the DNA stands which can lead to a whole new kind of species.

• Cells are basic units of all living things.
• DNA is found in the nucleus
• DNA is involved with the Genotype/Phenotype because Genotype is what makes up your genetic composition and Phenotype expresses the physical features you have.
• The process that allows for the expression of the Genotype is Protein Synthesis
Genetics cont.
What is biodiversity, how do humans affect it, and how does it affect humans?
Biodiversity is the variety of life. Humans affect biodiversity by cutting down trees, pollution, modifying the ecosystem of an area, and many other man-made reasons. Biodiversity affects humans by clean water, vulnerability to natural disasters in loss of certain things, health issues due to certain pathogens spreading

Why is biodiversity important to the Earth and to humans?
Biodiversity is important to humans because of the natural performances.
EX: green plants take-out carbon dioxide and release oxygen into the atmosphere, which helps keep the environment healthy and the human life set

How do genes (DNA) explain how different species are related?
DNA can explain how different species are related by having tests done on the similar traits in the different species and finding out the difference in genes that make them characteristically different.

Why are scientists interested in understanding how closely related organisms are to each other
Scientist are very interested in understanding how closely related organisms are to each other because they want to trace down the history that goes along with the organism/gene which can possibly lead to a new finding of a species from a long time ago tracing the biological evolution that may/may not have occurred

- What physical or behavioral characteristics reveal how living things are related?
Physical and behavioral characteristics can show how all living things are related. This can be justified simply taking the example of a family. There is a mom, dad, and daughter. The daughter has more characteristics from her mom but she is still genetically related to her dad.

- How are related organisms organized on a cladogram? How can you tell which organisms are most closely related? More distantly related?
To find how which organisms are closely related, you find the organisms at the tips and then work backwards until the lines converge at the common ancestors. Those organisms with the common ancestors nearer the tips where you started from share a more recent common ancestor.
How does the fossil record reveal information and evidence of evolution?
In fossil records, there is clear evidence that life has changed and evolved through time. Paleontologist look for fossils that have transitional features from one way of life to another. They also use fossils to create a "picture" of evolutionary change.

What can fossils tell us about diversity of organisms in the past and the future?
Fossils can tell us about the diversity of the organims in the past by clearly showing the animals and organisms where the bone has been transformed into a rock-like structure. It can tell us about the future by comparing old fossils with the same organisms that match them today.

How have recent discoveries in Genetics supported Darwin’s original theory of common ancestry?
DNA testing has now supported Darwin's original Evolution theory.

Topics Include:
- Evolution

- Genetics

- Fossil Records


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