Chapter 13

Meiosis I produces _____ cells, each of which is _____.

two ... haploid

Meiosis II typically produces _____ cells, each of which is _____.

four ... haploid

During _____ sister chromatids separate.

anaphase II

At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids.

telophase I

Synapsis occurs during _____.

prophase I

Homologous chromosomes migrate to opposite poles during _____.

anaphase I

During _____ chromosomes align single file along the equator of a haploid cell.

metaphase II

At the end of _____ and cytokinesis there are four haploid cells.

telophase II

During _____ a spindle forms in a haploid cell.

prophase II

Mitosis results in the formation of how many cells; meiosis results in the formation of how many cells?

two diploid cells ... four haploid cells

Which of the following occurs during meiosis but not during mitosis?

Synapsis occurs.

What is crossing over?

the exchange of homologous portions of nonsister chromatids

If a cell has completed meiosis I and is just beginning meiosis II, which of the following is an appropriate description of its contents?

It has half the amount of DNA as the cell that began meiosis.

After telophase I of meiosis, the chromosomal makeup of each daughter cell is _____.

haploid, and the chromosomes are each composed of two chromatids

How do cells at the completion of meiosis compare with cells that are in prophase of meiosis I? They have _____.

half the number of chromosomes and one-fourth the amount of DNA.

Which of the following happens at the conclusion of meiosis I?

Homologous chromosomes of a pair are separated from each other.

Sister chromatids separate from each other during _____.

mitosis and meiosis II

Which of the following occurs in meiosis but not in mitosis?

synapsis of chromosomes

What is a major difference between mitosis and meiosis I in a diploid organism?

Sister chromatids separate in mitosis, while homologous pairs of chromosomes separate in meiosis I.

If a cell has completed meiosis 1 and is just beginning meiosis 2, which statement is correct?

It is half the amount of DNA as the cell that began meiosis.

Homologous chromosomes are aligned at the equator of the spindel

Metaphase 1

Which of the following can occur by the process of meiosis but not mitosis

Diploid cells from haploid cells

In meiosis, homologous chromosomes are separated during

Anaphase 2

The best definition of a true breeding plant is that

Self fertilizer to produce off-spring identical to the parent

A mating between a true breeding purple flower pea plant, and true breeding white flowered pea plant would produce an

Hybrid

Alleles are described as

alternate versions of a gene

Mendel crossed true breeding purple flower plants with true breeding white flower plants & all resulting offspring made purple flowers. The allele for purple flowers is

Dominant

An individual who is homozygous

carries two copies of the same allele for a gene

Heterozygous

Dd

Which of these will only produce hterozygous off spring

DD x aa

Chromosomes that are not sex chromosomes are called

autosomes

What do we mean when we use the terms monohybrid cross and dihybrid cross?

dihybrid crosses involves organisms that heterozygous for only one character being studied.