11 BIOL 1001 Mutation Natural Selection (Jan. 30) post-lecture

05m 7938kg 259m 7257kg 274m 7348 kg 274m

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: changes that occur gradually over 3me? A.  The traits of each beetle within the popula3on gradually change. B.  The propor3ons of beetles having different traits within a popula3on change. C.  Successful behaviours learned by beetles are passed on to offspring. D.  Muta3ons occur to meet the needs of the beetles as the environment changes. 124 Upon what does selec3on act? During the killings… Before A1A2 A1A2 A1A2 A1A2 After A1A2 A2A2 A1A1 A2A2 A1A1 A1A2 A1A2 A2A2 A2A2 A1A2 A2A2 A2A2 A1A2 A1A1 A1A1 Genera0on 1 A1A2 A1A2 A2A2 Genera0on 2 •  What is the selec3ve force in this scenario? •  What is the selec3ve force ac3ng upon? • Natural selec3on acts on individuals; but evolu3onary change is seen at the level of the popula3on • Individuals do NOT evolve; popula3ons evolve 125 Upon what does selec3on act? During the killings… Before A1A2 A1A2 A1A2 After A1A2 A1A2 A2A2 A1A1 A2A2 A1A1 A1A2 A1A2 A2A2 A2A2 A1A2 A2A2 A2A2 A1A2 A1A1 A1A1 Genera0on 1 A1A2 A1A2 A2A2 Genera0on 2 •  What is the selec3ve force in this scenario? •  What is the selec3ve force ac3ng upon? • A1A2 = A2A2 in terms of phenotype • If bird is only factor affec3ng reproduc3ve output, then A1A2 & A2A2 should have equivalent fitness. 126 Summary: Natural Selec3on Evolu3on Popula3on that exhibits varia3on. Selec3ve pressure. Elimina3on of individuals with certain traits. Survivors reproduce. Increased frequency of trait that enhanced survival (& reproduc3ve success) = ADAPTATION 127 “Survival of the fiFest” Which of the following lions might a biologist consider to be the “most fit”? A. Harold B. Mar0n C. Ronald D. George Size 3.05m, 79.38kg 2.59m, 72.57kg 2.74m, 73.48 kg 2.74m,...
View Full Document

Ask a homework question - tutors are online