speciation. Flashcards
What causes selectional pressures?
= predation
= disease
= competition]
= organisms that give them selective advantages are more likleu to surivie,produce offspring and pass down these advantegous alleles, change in allele frequency, evolutuon
Why is there a wide range of variation in the in the phenotype?
= due to environmental and genetic factors
= genetoc variation is caused by mutation, meiosis, random fusion of gametes
What is disruptive speciation?
= individuals which contain the alleles, coding for either extreme trait
= survive and pass down alleles
= allele frequency changes, more individuals posses, the alele extreme traut, middling trait becomes less,
What is specitation?
= creation of a new species
= one original population of the same species becomes reproductivley isolated, cannot breed together, two populations pf the same spec ues
= accumulation of differences in gene pool, to the extent they cannot interbreed together, to produce fertile offspring