How would a biologist explain the variation in the beak sizes of these three species of finches? question 5 options: the beak sizes slowly changed over numerous generations with some growing larger and some growing smaller. the various habitats of the islands induced desirable genetic changes producing the variation seen today. they developed differences in beak size because of their need to be able to match the size of their beaks with the different types of food on these islands. variation in beak sizes occurred by chance and when a match between beak size and available food occurred, those birds produce more offspring. save

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