Ecology! Please do all the questions’ answer and explain why! 28. Which best des

Question

Ecology! Please do all the questions’ answer and explain why! 28. Which best describes the mutation accumulation hypothesis for the evolution of senescence? (a) Deleterious mutations with early age of onset are under stronger selection than similar mutations with late age of onset. (b) Populations will tend to have more early-onset deleterious mutations than late-onset deleterious mutations. (c) Both a and b are true (d) Both a and b are false 29. Alternative male mating strategies in coho salmon is an example of body size. (a) Disruptive (b) Stabilizing (c) Directional (d) Normalizing selection on male 30. The regression slope of fitness on phenotype is known as the... (a) Selection differential (b) Selection gradient (c) Narrow sense heritability (d) Selection response 31. The phenomenon of the phenotype depending on an interaction between alternative alleles within the same gene is known as. (a) Epistasis (b) Pleiotropy (c) Dominance (d) Heritability 32. Consider senescence, and Medawar's mutation accumulation hypothesis and Williams' antagonistic pleiortropy hypothesis. Which item below is shared by both hypotheses? (a) As age increases, the strength of selection decreases (b) As fecundity increases, longevity decreases (c) As offspring number increases, offspring quality decreases (d) None of the above

Explanation / Answer

28)D)both a and b are false because

the mutation accumulation theory states that tthe evolutionary effect of the various adverse events begins to decline and this happens around the age at which the given organism is capable of reproduction. This has nothing to do with both a and b

29)a)Disruptive

because male mating strategies in coho salmon leads to disruptive selection as it causes disruption in the body size of the males

30)b)Selection gradient because a selection gradient is defined as the the partial regression of a trait which is present on fitness while other options are not related to the fitness at all

31)d)Heritablity because it shows the interaction between 2 alleles in asingle gene so that the gene can inherit and grow further leading to heritability.

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