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Are new alleles made by natural selection?
No - natural selection does not create new alleles. Variation in alleles needs to exist in the population in order for natural selection to occur. Natural selection will involve the change in allele frequencies over time, but it does not create new alleles. New alleles are the result of mutations.
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".
Are mutations the only way to add new genes to a gene pool?
yes. independent assortment and crossing over in mitosis will add new combinations of alleles to the DNA but only mutations will create new genes.
What is the major source of new alleles in natural populations?
either new organisms entered the population from an external source, or there were mutations
What can cause changes in DNA sequences?
mutations
How do mutations affect genetic equilibrium?
by introducing new alleles
What is the only true source of original variation in alleles?
Mutations
Changes in DNA are called mutations?
the answer is mutations.......................
Mutations are changes in?
changes in DNA
How does a animal evolve?
Natural Selection (environment favours certain traits over others), genetic drift(random changes), mutations(random changes to genes, create new alleles), immigration/ emigration (introduction of foreign alleles to population) sexual selection (females favour certain traits, these males pass on genes) , speciation (formation of new species because of any of above, geographic speciation- new species-= can only breed with others from that species)
What are the instinct against inbreeding?
Genetic diseases and mutations as a result of the pairing of bad alleles.
What are the two types of gene shuffling?
Gene shuffling means the genetic recombination and mutations of a gene pool of a species where genetic recombination is the mixture of parent alleles that are passed on and the mutations are the random changes in an organisms DNA that are passed on.
