Second, the random assortment of tetrads on the metaphase plate produces unique combinations of maternal and paternal chromosomes that will make their way into the gametes. Random, independent assortment during metaphase I can be demonstrated by considering a cell with a set of two chromosomes (n = 2).
Why is random alignment of chromosomes so important during metaphase I and II?
Segments of DNA are exchanged between maternally derived and paternally derived chromosomes, and new gene combinations are formed. b. Random alignment during metaphase I leads to gametes that have a mixture of maternal and paternal chromosomes. … Fertilization is random, in that any two gametes can fuse.
Why do chromosomes need to align at the metaphase plate in both mitosis and meiosis?
The alignment of the chromatids along the metaphase plate ensures that the new cells that will be formed will be identical. The chromatids must be attached to the microtubules from both poles of the cell and aligned at the metaphase plate for the spindle assembly checkpoint to take place.
How does human life depend on mitosis?
Replacement and regeneration of new cells– Regeneration and replacement of worn-out and damaged tissues is a very important function of mitosis in living organisms. Mitosis helps in the production of identical copies of cells and thus helps in repairing the damaged tissue or replacing the worn-out cells.
What is the correct order of these meiotic events?
The correct order of mitotic events which occur during meiosis is: Formation of synaptonemal complex, recombination, separation of homologous chromosomes, separation of sister chromatids.
What is the process of mitosis?
Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells. During cell division, mitosis refers specifically to the separation of the duplicated genetic material carried in the nucleus.
What is the process of connecting the Tetrad?
meiosis and chromosome role
Each pair of chromosomes—called a tetrad, or a bivalent—consists of four chromatids. At this point, the homologous chromosomes exchange genetic material by the process of crossing over (see linkage group).
What are two processes in meiosis that help ensure genetic diversity in offspring?
Genetic variation is increased by meiosis
Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.
What stage in meiosis does random alignment occur quizlet?
During meiosis, variation in the daughter nuclei is introduced because of crossover in prophase I and random alignment at metaphase I. The cells that are produced by meiosis are genetically unique.