either new organisms entered the population from an external source, or there were mutations
New alleles arise through mutations (e.g., point mutations, like when the base or nucleotide A is changed to C, G, or T) and recombination of existing alleles.
Mutation in parent cells.
mutation
mutation
mutations
mutation
Yes. Genetic drift-- the change in allelic frequencies of a population due to chance-- can play a major role in evolution. The effects of drift are most pronounced in small, isolated populations. Drift can bring alleles to fixation very quickly in such populations, and can lead to genetic differentiation between them, possibly contributing to speciation.
I think that the increasing and decreasing of the other populations was a major disturbance that the ecosystem was able to recover compelety
oxygen
A major factor in the growth of the population of the English colonies was the number of settlers that immigrated to the colonies. They caused the populations to gradually grow as they settled in these colonies.
Recombination, or crossing over, is the process by which homologous chromosomes exchange genetic material during meiosis. This creates gametes with many different combinations of alleles, and is a major source of genetic variation in sexually reproducing species.
helium
In India, the major source of power is coal, followed by hydroelectricity, petroleum, natural gas and nuclear power respectively.
When alleles are recombined during sexual reproduction, they can produce dramatically different phenotypes. Thus, sexual reproduction is a major source of variation within many population.
The major commercial source of natural rubber latex is the Pará rubber tree. It is a member of the spurge family which is Euphorbiaceae.
There is no maximum number of alleles. Biology Major
They are whales major food source, without them they would die
There are 57 different countries having major Muslim populations.
Yes. Genetic drift-- the change in allelic frequencies of a population due to chance-- can play a major role in evolution. The effects of drift are most pronounced in small, isolated populations. Drift can bring alleles to fixation very quickly in such populations, and can lead to genetic differentiation between them, possibly contributing to speciation.
Coal (solid), petroleum (liquid), natural gas (gas).
Tehran, Iran
the major source is sun
The only external source of the earth's energy is the sun. The sun controls the weather which includes hazards such as tornados, hurricanes, and sunburn