BIOL 241 Midterm 1 Actual study
Questions and correct/verified Answers
meiosis - ANSW-Cell division that produces reproductive cells in sexually reproducing organisms
mitosis - ANSW-cell division in which the nucleus divides into nuclei containing the same number of
chromosomes
ploidy - ANSW-number of sets of chromosomes in a cell
cell cycle - ANSW-The regular sequence of growth and division that cells undergo
Prophase - ANSW-first and longest phase of mitosis, during which the chromosomes condense and
become visible and the centrioles separate and take up positions on the opposite sides of the nucleus;
the nuclear envelope breaks down
metaphase - ANSW-second phase of mitosis, during which the chromosomes line up across the center of
the cell
Anaphase - ANSW-Phase of mitosis in which the chromosomes separate and move to opposite ends of
the cell
Telophase and Cytokinesis - ANSW-Pairs arrives at poles and cell is pinched apart, separating into two
cells.
meiosis I - ANSW-The first division of a two-stage process of cell division in sexually reproducing
organisms that results in cells with half the number of chromosome sets as the original cell.
meiosis II - ANSW-the second phase of meiosis consisting of chromatids separating, along with the two
diploid cells splitting in two
prophase I - ANSW-The chromosomes condense, and the nuclear envelope breaks down. crossing-over
occurs. Chiasma is present
metaphase I - ANSW-The pairs of homologous chromosomes line up in the center of the cell. The
centromere of each chromatid pair attaches to one spindle fiber.
anaphase I - ANSW-Homologous chromosomes are pulled to opposite ends of the cell. Note that
chromatids do not separate - each duplicated chromosome still has two chromatids.
telophase I - ANSW-The cytoplasm divides and two new cells form. Each new cell has one duplicated
chromosome from each similar pair.
prophase II - ANSW-The first phase of meiosis II. Prophase II is identical to mitotic prophase, except that
the number of chromosomes was reduced by half during meiosis I.
metaphase II - ANSW-The duplicated chromosomes move to the center of the cell. Each centromere
attaches to two spindle fibers instead of one.
anaphase II - ANSW-The centromere divides. The chromatids seperate and move to opposite ends of the
cell. Each chromatid is now an individual chromosome.
Questions and correct/verified Answers
meiosis - ANSW-Cell division that produces reproductive cells in sexually reproducing organisms
mitosis - ANSW-cell division in which the nucleus divides into nuclei containing the same number of
chromosomes
ploidy - ANSW-number of sets of chromosomes in a cell
cell cycle - ANSW-The regular sequence of growth and division that cells undergo
Prophase - ANSW-first and longest phase of mitosis, during which the chromosomes condense and
become visible and the centrioles separate and take up positions on the opposite sides of the nucleus;
the nuclear envelope breaks down
metaphase - ANSW-second phase of mitosis, during which the chromosomes line up across the center of
the cell
Anaphase - ANSW-Phase of mitosis in which the chromosomes separate and move to opposite ends of
the cell
Telophase and Cytokinesis - ANSW-Pairs arrives at poles and cell is pinched apart, separating into two
cells.
meiosis I - ANSW-The first division of a two-stage process of cell division in sexually reproducing
organisms that results in cells with half the number of chromosome sets as the original cell.
meiosis II - ANSW-the second phase of meiosis consisting of chromatids separating, along with the two
diploid cells splitting in two
prophase I - ANSW-The chromosomes condense, and the nuclear envelope breaks down. crossing-over
occurs. Chiasma is present
metaphase I - ANSW-The pairs of homologous chromosomes line up in the center of the cell. The
centromere of each chromatid pair attaches to one spindle fiber.
anaphase I - ANSW-Homologous chromosomes are pulled to opposite ends of the cell. Note that
chromatids do not separate - each duplicated chromosome still has two chromatids.
telophase I - ANSW-The cytoplasm divides and two new cells form. Each new cell has one duplicated
chromosome from each similar pair.
prophase II - ANSW-The first phase of meiosis II. Prophase II is identical to mitotic prophase, except that
the number of chromosomes was reduced by half during meiosis I.
metaphase II - ANSW-The duplicated chromosomes move to the center of the cell. Each centromere
attaches to two spindle fibers instead of one.
anaphase II - ANSW-The centromere divides. The chromatids seperate and move to opposite ends of the
cell. Each chromatid is now an individual chromosome.
