Bio HW- Evolution

  • Thread starter brdmadgrl
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Can you please help me with checking my answers to Evolution homework? It's in a take-home quiz format. I always second guess myself with these types of questions. Thank you in advance!

1) Over time, alleles that are most beneficial to individual fitness will increase in frequency in the population while less beneficial forms of the same gene (i.e. less beneficial alleles at the same locus) decrease in frequency.

My answer to this question was true because if the alleles control reproductive success then they must decrease in frequency over time. Am I thinking about this right?

2) Alleles decrese and increase in frequency at random, whether one becomes more common or less in a population has nothing to do with the effect of the allele on the survival or reproductive success of its owners.

My answer: I believe this is false. While alleles control the phenotype, couldn't this effect survival and reproductive success if let's say the alleles for XY chromosome increased and they because the only one in the group where the species could no longer reproduce
(thinking about a fly example where they died out).

3) Natural selection is the relative success of individuals within populations that determines which alleles will become more common and which become less common. Relative success of populations and of different species have a much weaker effect on changes in allele frequencies

My answer: true because it occurs at a genetic level. however, it could be false if based on adaptation of species to their environment that can alter allele frequency in a population? I am not sure i am understanding this question correctly.

4) Although the end result of natural selection is to change allele frequencies in populations, the change in allele frequencies is result of success or failure of different kinds of phenotypes. Alleles that are most beneficial to survival and reproduction of phenotypes are those that will increase in the population

My answer: false?
 

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