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Chapter 8 Biology

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During anaphase II _____.
sister chromatids seperate and migrate toward opposite poles.
Varation occurs when chromosomes are shuffled in ____.
meiosis
Two chromosomes in a nucleus that carry genes controlling the same inherited characteristics are___.
Homologous chromosomes.
crossing over occurs during___?
prophase I
Which of the following is a normal female?
XX
Synapsis occurs during
prophase I
During anaphase I ____.
homolugues seperate and migrate toward opposite poles.
Both mitosis and meiosis are preceded by
interphase
Mitosis and cytokinesis result in the formation of _____; meiosis and cytokinesis result in the formation of _____.
2 diploid cells.... 4 haploid cells
What is the typical result when a diploid cell undergoes meiosis?
4 haploid cells
A example of a cell that is 2n is....
a somatic cell
What is the key difference between meiosis and mitosis?
Synapsis occurs
The diploid phase of human life begins with
fertilization
Independent oreintation of chromosomes at metaphase I results in an increase in the number of ___
possible combination of characteristics
Without crossing over
genetic recombination would not occur
At a critical point in meiosis, the chromosomes do not replicate. This occurs between _____.
metaphase I and anaphase I
During meiosis I, homologous chromosomes form a tetrad. What does this accomplish?
Crossing over can occur, creating new combinations of chromosomes through their independent alignment across the metaphase plate
Which phase of meiosis does synapsis and crossing over occur?
Prophase I
In anaphase I__
homologus chromosomes move toward opposite poles
At the end of telophase I of meiosis, as cytokinesis occurs, there are _____.
2 haploid cells
In meisosis II
sister chromatids are seperated
The M phase of mitosis and M phase of meiosis both occur after interphase. However, the two processes differ in the arrangement and behavior of their chromosomes. How?
The pairing up of homologous chromosomes and crossing over only occur during meiosis.
Crossing over is important because it causes
allows the exchange of genes between homologus chromosomes.
When we say that an organism is a haploid, we mean that
its cells each have one set of chromosomes
The function of meiosis is to make___.
4 cells with a haploid number of chromosomes.