Hawaiian honeycreepers (birds), consisting of 50 species, some of which are now extinct, represent a much more diverse lineage than hawaiian thrushes. honeycreepers have a remarkable variation in bill morphology, whereas hawaiian thrushes exhibit far less morphological variation. bill morphology is strongly linked to the resources available for these birds to eat. this suggests that in honeycreepers may have occurred as a result of

a) sexual dimorphism: leksb) allopatric speciation; hybrid zonesc) sexual selection; monogamous pair bondsd) adaptive radiation; dietary specializatione) adaptive radiation; poor dispersal ability

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

cell/ tissue/ organ/ organ system/ body