Question

when a eukaryotic cell undergoes cellular division, creating two new daughter cells - an error (nondisjunction) in which step would most likely impact the number of chromosomes in the daughter cells nuclei.
what is this step?
a prophase in endocytosis
b anaphase in mitosis
c metaphase in mitosis
d telophase in interphase
question 19
which of the following correctly identifies the main role of mitosis and cytokinesis in multicellular organisms?
a replicate dna
b produce gametes (sperm or eggs)
c increase genetic diversity
d growth and repair
question 20
the model shows a step in the process of cell division.
which of the following best describe this step?
a telophase
b anaphase
c prophase
d mitosis

Explanation:

For the first question:

• In mitosis, anaphase is the stage where sister chromatids separate and move to opposite poles. Nondisjunction (failure of separation) in anaphase would lead to an incorrect number of chromosomes in daughter cells. Endocytosis is not a part of cell division. Metaphase is when chromosomes align at the equator. Interphase is not a stage of mitosis (it is a preparatory phase), and telophase is the final stage of mitosis where nuclei reform.

For the second question:

• DNA replication occurs in interphase. Gametes are produced by meiosis. Genetic diversity is increased by processes like crossing - over in meiosis. Mitosis and cytokinesis are mainly for growth (increasing cell number) and repair (replacing damaged cells) in multicellular organisms.

For the third question:

• In prophase, the nuclear membrane breaks down (as shown in the model), chromosomes condense (visible as X - shaped structures). In telophase, the nuclear membrane reforms. In anaphase, chromosomes are moving apart. Mitosis is the whole process of nuclear division (including prophase, metaphase, anaphase, telophase), and the model shows a specific stage (prophase).

Answer:

1. b
2. d
3. c