BIOB50H3 Lecture Notes - Lecture 8: Mutation Rate, Genetic Variation, Allele

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cyanseal212

3 Dec 2015

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This is looked at according to the mutations per generation: evolution of mutation rate, the changes that occur within the mutation rate within a population. Gene: gene is a dna sequence that code for particular rna sequence or a protein. Locus: the location of a gene on a chromosome. Allele: version of a gene which is comprised with a ifferent nucleotide sequence. There are always two alleles for one gene. which effects an organism on a larger functional level. Mutation: changes in the nucleotide sequence in an allele. Or: mean % of individuals which are heterozygous for a gene per locus. If we have three individuals, and we look at two different loci showing us a, b allele: one individual is aabb, the second one is aabb, the third is aabb. Looking at these data from any population we can say that the.

Related Questions

Which of the following is most likely as a population goes through a bottleneck?

Heterozygosity decreases because genetic distance increases.

Genetic diversity increases because mutation rate increases while the population is going through the bottleneck

. Genetic diversity decreases because some alleles can be lost as the number of individuals dwindles

. The proportion of individuals that are heterozygous increases because there are fewer individuals.

2)What is meant when it says that genetic drift produces "non-adaptive" evolution?

Sometimes natural selection can favor a trait that is good for the current conditions, but when conditions change it is no longer helpful.

Evolution is just a genetic change in a population. If genes are lost from a population due to chance (i.e. genetic drift), that may not be adaptive, meaning the remaining organisms are no more fit.

Evolution isn't perfect, and sometimes it makes mistakes.

whitekoala529

What must occur in order for a new trait to appear in a population and then reach a steady, high frequency within that population?

New traits appear through gene mutations or through genetic drift. In order to reach a steady, high frequency in the population, there must be many mutagens, such as UV radiation, in the environment to produce many mutations.

New traits appear through gene mutations or through genetic drift. In order to reach a steady, high frequency in the population, there must be a consistent source of immigrant individuals with the allele.

New traits appear through gene mutations or through evolution. In order to reach a steady, high frequency in the population, the allele must code for a favorable adaptation.

New traits appear through gene mutations or through gene flow. In order to reach a steady, high frequency in the population, the trait associated with the gene must be favored by either natural or sexual selection.

tealspider730

1)Explain Motoo Kimuraâs contribution to our understanding of population evolution. What is âneutral evolutionâ? How do you know that a population is in mutation-drift equilibrium at a locus? Why do we care about evolution in genetic regions that donât code for protein product?

2)Use language to explain what the Wright-Fisher model (the equation 1/2N_e ) is âsayingâ. Be able to use the equation to explicitly demonstrate how genetic drift may occur under different circumstances.

3)Use language to explain what the Moran model (the equation Var (p_t+1) = 2p₁q₁/2N) is âsayingâ. Be able to use the equation to explicitly demonstrate how genetic drift may occur under different circumstances.

4)What is a âselectively neutral locusâ? When mutations occur in the genome, do regions which are selectively neutral accumulate mutations which persist in the population at the same rate, when compared to loci under selection? Why or why not?

5)Why donât all organisms exhibit identical neutral mutation rates? Why doesnât every region of the genome exhibit identical neutral mutation rates? What is a mutational âhotspotâ, and what type of DNA sequence might be found there?

BIOB50H3 Lecture Notes - Lecture 8: Mutation Rate, Genetic Variation, Allele

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