Lesson 10: Meiosis

Variation occurs when chromosomes are shuffled in _____.

meiosis

The correct order of events during meiosis is

prophase I, metaphase I, anaphase I, telophase I, cytokinesis, meiosis II.

During meiosis, segments of nonsister chromatids can trade places. This recombination of maternal and paternal genetic material is a key feature of meiosis. During what phase of meiosis does recombination occur?

prophase I.

An example of a cell that is 2n is a __________.

somatic cell

In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing __________ chromosomes.

5

Crossing over of chromosomes during meiosis shuffles parental chromosomes, resulting in a genetically unique child. Select the three true statements about crossing over. Chiasmata in nonsister chromatids decrease the genetic variability produced during crossing over. During meiosis II, sister chromatids separate into four different gametes. A hybrid chromosome that has crossed over will contain pieces of both the maternal and paternal chromosomes. During prophase I of meiosis I, homologous paternal and maternal chromosomes pair up and undergo crossing over. Chromosomes from the egg and the sperm undergo crossing over immediately after fertilization occurs.

During meiosis II, sister chromatids separate into four different gametes. A hybrid chromosome that has crossed over will contain pieces of both the maternal and paternal chromosomes. During prophase I of meiosis I, homologous paternal and maternal chromosomes pair up and undergo crossing over.

Which statement regarding the function of mitosis is false? Mitosis promotes genetic diversity. Mitosis promotes repair tissues. Mitosis is necessary for asexual reproduction in eukaryotes. Mitosis allows organisms to grow.

Mitosis promotes genetic diversity.

Which statement regarding mitosis and meiosis is true? Sister chromatids separate during anaphase of mitosis and anaphase II of meiosis. Independent orientation occurs during metaphase of mitosis and metaphase II of meiosis. Mitosis takes place in your gametes, whereas meiosis takes place in your somatic cells. In metaphase of mitosis and metaphase I of meiosis, homologous chromosomes separate.

Sister chromatids separate during anaphase of mitosis and anaphase II of meiosis.

Meiosis differs from mitosis in that _____ only occurs in meiosis.

crossing over

What is the typical result when a diploid cell undergoes meiosis?

four haploid cells

Meiosis starts with a single diploid cell and produces

four haploid cells.

At the conclusion of meiosis I, the daughter cells are _____.

haploid and the sister chromatids are joined

During prophase I of meiosis,

homologous chromosomes stick together in pairs.

Two chromosomes in a nucleus that carry genes controlling the same inherited characteristics are

homologous chromosomes.

A cell preparing to undergo meiosis duplicates its chromosomes during

interphase

Independent orientation of chromosomes at metaphase I results in an increase in the number of

possible combinations of characteristics.

At the end of telophase I of meiosis, as cytokinesis occurs, there are __________.

two haploid cells