During metaphase I, the homologous chromosomes are arranged in the center of the cell with the kinetochores facing opposite poles. The orientation of each pair of homologous chromosomes at the center of the cell is random.
How the random alignment of homologous chromosomes during metaphase 1 contributes to the variation in gametes produced by meiosis?
Explain how the random alignment of homologous chromosomes during metaphase I contributes to the variation in gametes produced by meiosis. Random alignment leads to new combinations of traits. The chromosomes that were originally inherited by the gamete-producing individual came equally from the egg and the sperm.
What happens to homologous chromosomes during metaphase of meiosis I?
In meiosis I, the homologous chromosome pairs become associated with each other, are bound together with the synaptonemal complex, develop chiasmata and undergo crossover between sister chromatids, and line up along the metaphase plate in tetrads with kinetochore fibers from opposite spindle poles attached to each …
What is the random distribution of homologous chromosomes during meiosis?
When cells divide during meiosis, homologous chromosomes are randomly distributed to daughter cells, and different chromosomes segregate independently of each other. This called is called independent assortment.
What is the term that describes this random orientation of homologous chromosomes in metaphase I?
Independent assortment is due to the random orientation of pairs of homologous chromosomes in meiosis I.
Which is an advantage of the random alignment of the chromosomes during metaphase 1?
Explain how the random alignment of homologous chromosomes during metaphase I contributes to variation in gametes produced by meiosis. Random alignment leads to new combinations of traits. The chromosomes that were originally inherited by the gamete-producing individual came equally from the egg and the sperm.
What is random fertilization?
Random fertilization refers to the fact that if two individuals mate, and each is capable of producing over 8million potential gametes, the random chance of any one sperm and egg coming together is a product of these two probabilities – some 70 trillion different combinations of chromosomes in a potential offspring.
How do the homologous chromosomes line up in metaphase I compared to metaphase of mitosis?
Metaphase I: During metaphase I, the spindle apparatus forms from opposite ends of the cell. The spindle apparatus then sends out spindle fibers to attach to the chromosomes. However, since the homologous chromosomes are lined up side by side for crossing over, they are tightly held together.
How are chromosomes arranged in metaphase?
During metaphase chromosomes are arranged on a plane which is known as an equatorial plate. Metaphase is a stage in which the eukaryotic cell division takes place resulting in the alignment of chromosomes in the middle of the cell.
Do homologous chromosomes align on the metaphase plate in meiosis II?
In metaphase I, the homologous pairs of chromosomes align on either side of the equatorial plate. … During metaphase II, the centromeres of the paired chromatids align along the equatorial plate in both cells. Then in anaphase II, the chromosomes separate at the centromeres.
What is metaphase?
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes. … During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell. During this stage in human cells, the chromosomes then become visible under the microscope.
What refers to the random distribution of homologous chromosomes into gametes?
The random distribution of homologous chromosomes during meiosis is called independent. assortment.
How does random assortment of homologous chromosomes contribute to genetic variation?
During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
Where does random orientation occur?
Random Orientation refers to the behaviour of homologous pairs of chromosomes (metaphase I) or pairs of sister chromatids (metaphase II) in meiosis.
What phase does random segregation occur?
Chromosome segregation occurs at two separate stages during meiosis called anaphase I and anaphase II (see meiosis diagram).
What is random chromosome assortment?
Random assortment of chromosomes refers to the way chromosomes get organized into daughter cells during gamete (sperm and egg) formation. It means that each sperm and each egg will have different combinations of chromosomes, some of which will have come from the person’s mother and others from the father.