comparative method Flashcards
the hallmark studying potential adaptation and trends in adaptive response
interspecific comparisons
“flying foxes” one of the two main groups of bats that compromise about 175 species
megachiroptera
megachiroptera species vary greatly in
1.
2.
colony size
teste size
hypothesis questions asked about mating systems and sperm competition in Megachiroptera
is large teste size an adaptation to colonal living?
is testis size associated with group size?
the chorelation of relative testes size to roost group size implies that
larger teste mass has positive correlation with social group size
larger testes are associated with smaller
brains
brains and testes are both metabolically expensive to grow and maintain, this may represent an evolutionary _ in metabolically limited bats
tradeoff
an aspect of lineages genetics makeup that prevents the lineage from reaching a particular or potentially advantageous evolutionary outcome
evolutionary constraint
when an increase in fitness due to changes in one trait is opposed by a decrease in fitness due to a concomitant change in the second trait
evolutionary tradeoff
what are the roles of the male and female begonia flower
male flowers make pollen
female flowers offer no reward
what were the 2 hypothesis for the female begonia flower
female will undergo stabilizing election to look more like the male
female will undergo directional selection to have larger flower size m
during research of the begonia, it was found that bees favor
larger flowers
if bees favor larger flowers, why aren’t females adapting to be huge?
the plant will produce les flowers if they are bigger,
there plant will not be able to support large heavy flowers
the evolution of flower size in the begonia system has likely been determined by competing factors (3)
directional selection for larger flowers
trade off between flower size and number
constraint of physical structure/size of inflorescence
