Bio - Meiosis/Mitosis
After meiosis II the daughter cells will contain ____ chromosomes if the original cell contained 78.
39
telophase 11
A nuclear envelope forms around each set of chromosomes. the cytoplasm divides. nuclear membrane and nuclei reforms.
prophase 11
A second set of spindle forms around the chromosomes
When does replication of chromosomes occur in animal cell meiosis?
Before Meiosis 1 only
Prophase 1
Chromosomes become visible; nuclear envelope breaks down; crossing-over occurs.
metaphase 11
Haploid (half) number of chromosomes line up in the middle of the cell
n cells
Haploid (one set of each chromosome) (meiosis)
A pair of identical chromosomes shown in a karyotype, one inherited from mom, and one inherited from dad are called
Homologous chromosomes
metaphase 1
Paired homologous chromosomes line up across the center of the cell. Chromosome centromeres attach to spindle fibers
synapsis
Pairing of homologous chromosomes
Meiosis II
Sister chromatids separate (cytokinesis) Results in 4 haploid daughter cells with unreplicated chromosomes.
Which statement correctly describes meiosis?
The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell
Telophase 1 (meiosis)
The chromosomes reach the opposite end of cell and cytokinesis begins. The cell divides
Which of the following best explains why the chromosome number is an even number in organisms?
The diploid chromosome number represents pairs of chromosomes, one from each parent, so that it is always an even number
Which sex chromosomes would indicate a typical human female?
XX
Which sex chromosomes would indicate a typical human male?
XY
2n cells
diploid (two sets of chromosomes) (mitosis)
Which of the following cells is a gamete?
egg
In sexual reproduction, chromosome reduction is necessary to ___.
ensure that all offspring have the correct diploid number of chromosomes
Meiosis is the key process in the production of_________.
gametes
What is one of the advantages to reproducing sexually versus asexually?
genetic variation
The pair of chromosomes that contain the same genes (but may be coded differently) and are inherited from a male and female parent are termed ___.
homologous chromosomes
anaphase 1
homologous chromosomes separate and are pulled to opposite ends of the cell
Which process is necessary for the inherited traits of an organism to be passed along by sexual reproduction?
meiosis
Which of the following produces identical nuclei in cells?
mitosis
Which of the following represents chromosome # during fertilization?
n+n=2n
Meiosis is the
nuclear division of gametes
Which would be considered a somatic cell?
skin cell
anaphase 11
the sister chromatids separate and move toward opposite ends of the cell