Chapter 13
Homologous chromosomes are aligned at the equator of the spindel
Metaphase 1
At the end of _____ and cytokinesis there are four haploid cells.
telophase II
Heterozygous
Dd
During _____ sister chromatids separate.
anaphase II
Sister chromatids separate from each other during _____.
mitosis and meiosis II
In meiosis, homologous chromosomes are separated during
Anaphase 2
Which of these will only produce hterozygous off spring
DD x aa
Which of the following can occur by the process of meiosis but not mitosis
Diploid cells from haploid cells
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
Which of the following happens at the conclusion of meiosis I?
Homologous chromosomes of a pair are separated from each other.
A mating between a true breeding purple flower pea plant, and true breeding white flowered pea plant would produce an
Hybrid
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.
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.
The best definition of a true breeding plant is that
Self fertilizer to produce off-spring identical to the parent
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.
Which of the following occurs during meiosis but not during mitosis?
Synapsis occurs.
Alleles are described as
alternate versions of a gene
Homologous chromosomes migrate to opposite poles during _____.
anaphase I
Chromosomes that are not sex chromosomes are called
autosomes
An individual who is homozygous
carries two copies of the same allele for a gene
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.
Meiosis II typically produces _____ cells, each of which is _____.
four ... haploid
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.
After telophase I of meiosis, the chromosomal makeup of each daughter cell is _____.
haploid, and the chromosomes are each composed of two chromatids
During _____ chromosomes align single file along the equator of a haploid cell.
metaphase II
Synapsis occurs during _____.
prophase I
During _____ a spindle forms in a haploid cell.
prophase II
Which of the following occurs in meiosis but not in mitosis?
synapsis of chromosomes
At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids.
telophase I
What is crossing over?
the exchange of homologous portions of nonsister chromatids
Meiosis I produces _____ cells, each of which is _____.
two ... haploid
Mitosis results in the formation of how many cells; meiosis results in the formation of how many cells?
two diploid cells ... four haploid cells