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Is it true that mutations can increase the variations in a species trait?
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What are causes for mutations?
Differences in the genetic code that lead to advantages above other members of the species. Thus if it is a valued trait it will be passed on.
How do species get variation?
Species diversify via genetic mutations. Say organism A has 4 offspring, and they all have trait 1, which is characteristic of the species, except one baby, which has trait 2 (call this one organism B). Later on organism B has offspring which all have trait 2, and a couple other new traits that are uncharacteristic of the species. Eventually, the descendants of organism B will be so different from the descendants of organism B's siblings, that they could be considered a new species.
Why are new alleles formed?
Mutations can change what protein a section of codes for. The production of different proteins would cause different physical development; a new allele or "trait".
What is the standard way of labeling the variations of a particular trait?
ok there is a such thing called a punnet square you can label them by putting the trait in one of those
How can a wide range of phenotypes increase the chance that some indivisuals will survive in a changing environment?
Genetic variation is fundamental to evolution. The less variation there is the slower and less effective evolution becomes. Evolution works by selecting for or against different variations of a trait. In this way species are able to adapt to environmental changes. Species that have many variations of a trait are better suited to adapt to environmental changes by evolving. A classic example of this is the gene that codes for hemoglobin. Many alleles (or variations) exist for this gene due to genetic mutations. 2 common variations are the HbA and HbS alleles. HbA is dominant and codes for normal hemoglobin. HbS on the other hand is recessive and codes for mutant sickled hemoglobin. So individuals that are homozygous HbS (they have the HbS/HbS genotype) have a deadly disease called sickle cell anemia. However, in certain parts of the world malaria is a common disease that works by effecting blood cells. It turns out that heterozygotes (HbA/HbS) have a natural immunity to malaria. So here, genetic variation gives evolution a chance to "defeat" the malaria disease by favoring heterozygotes. If no variation existed in the gene that codes for hemoglobin, such adaptation would be impossible.
What are causes for mutations?
Differences in the genetic code that lead to advantages above other members of the species. Thus if it is a valued trait it will be passed on.
The two different extreme variations in a trait are favored in?
The two extreme variations in a are trait are favored in disruptive selection.
How do species get variation?
Species diversify via genetic mutations. Say organism A has 4 offspring, and they all have trait 1, which is characteristic of the species, except one baby, which has trait 2 (call this one organism B). Later on organism B has offspring which all have trait 2, and a couple other new traits that are uncharacteristic of the species. Eventually, the descendants of organism B will be so different from the descendants of organism B's siblings, that they could be considered a new species.
What happens to the proportion of the beneficial traits in a species over time according to the theory of evolution?
The ratio of beneficial traits tends to increase until each member of the species possesses the trait, at which point the trait is fixed.
When many genes contol a trait the trait will show a large number of what?
Variations
What could happen to DNA that would cause a change in trait or a new trait to be expressed?
That would be a mutation. There are several types of mutations such as silent, nonsense, missense mutations along with inserstions, deletions and amplifications
Why are new alleles formed?
Mutations can change what protein a section of codes for. The production of different proteins would cause different physical development; a new allele or "trait".
Which type of mutation is responsible for new variations of a trait?
matation in somatic
Is evolution valid?
No. Evolution is not valid. Evolution suggests that one species changes into another species. Given all that we know about DNA, there is no possible way for any one species to change into another species even with mutations. Mutations make the individual organism weaker than the average organism of the species population and in many cases causes that organism to be sterile. Even if the individual organism does reproduce, the weak trait will be covered by the dominant allele thus rendering the mutation dormant. There would need to be a simultaneous catastrophic production of the mutation on a mass scale within the population for the mutation to even show up on a large scale in the population. Even if this magically occurred, there would not be a new species, only a new trait that shows up in the species. There is not a single documented case of any species changing into a new species.
Are big ears a dominant trait?
Big ears in some species are considered to be a dominant trait. In other species having big ears is a recessive trait.
Why variations are important to understanding change in a population over time?
you guys should put an answer place i need it for my homework
Mutations within the DNA sequence of an organism can?
Result in early embryonic death, disease, deformity, have no obvious effect, have a long term positive effect if the mutation is beneficial to the subject organism's species as a whole and if environmental pressure increases the survival rate of individuals with the trait. Frequency of occurrence can decrease or increase based on genetic drift in smaller isolated populations.
