Chapter 11 Post Class
What event in meiosis leads to the cell becoming haploid rather than the separation of sister chromatids ?
Formation of bivalents lead to spindle fibers from opposite poles attaching to homologous chromosomes
At the end of meiosis II, there are
Four haploid cells, with each chromosome consisting of a single chromatid
Random orientation of homologous chromosomes occurs in______ of meiosis.
metaphase I
Mutations can occur in any cell of the human body that contains DNA. However, only mutations in _____ can be passed on to the next generation.
Germ-line cells
During anaphase I of meiosis, ______ move towards opposite cell poles, whereas during anaphase II of meiosis, _____ are separated.
Homologous Chromosomes; sister chromatids
Why are two Phases of meiosis necessary?
In order to both reduce the chromosome number and separate sister chromatids
The number of cells produced in meiosis is
twice the number of cells produced in mitosis
A tetrad is made up
two homologous chromosomes, each consisting of two chromatids
Which of the following describes meiosis II in humans?
1N-> 1N
If sister chromatids failed to separate during meiosis II, what would the resulting gametes look like?
2 gametes will be normal, 1 gamete will have 2 of the affected chromosomes, and 1 gamete will have 0 of the affected chromosomes
Arrange the following events in the proper order in which they occur during meiosis I 1= separation of homologous chromosomes 2= Synapsis 3= Crossing-Over 4= Independent Assortment
2, 3, 4, 1
Which of the following events occurs during prophase 1?
breakdown of nuclear envelope, condensation of chromosomes, and movement of centrosomes
In animals, cells that will eventually undergo meiosis to produce the gametes are set aside early in the course of development. These cells are called
germ-line cells
At the end of meiosis I, each daughter cell is
haploid, and each chromosome consist of two chromatids
The number of chromosomes per cell is reduced from two sets to one set during
meiosis I
Suppose you have a multicellular eukaryotic organism that is composed entirely of haploid cells. This organism would produce gametes by the process of
mitosis
Centromeres divide in
mitosis and meiosis II
The spindle apparatus is fully formed by the end of
prometaphase II
Which of the following events occurs during anaphase I?
separation of homologous chromosomes
Separation of _____ occurs in anaphase II of meiosis
sister chromatids
In germline cells, when does DNA replicate?
During S phase
Which of the following features are unique to meiosis?
Synapsis, homologous recombination, and reduction division
Which of the following is not a haploid?
a cell in prophase I
