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How do the chromosomes become different from eachotther in meiosis?
Wiki User
∙ 11y ago
The chromosomes become different from each other due to crossing over which occurs during prophase I.
Wiki User
∙ 11y ago
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What is the change in chromosome number in meiosis?
The Reduction of Chromosome Number in Meiosis Is Determined by Properties Built into the Chromosomes. In meiosis I, two chromatids move to each spindle pole. Then, in meiosis II, the two are distributed, one to each future gamete. This requires that meiosis I chromosomes attach to the spindle differently than meiosis II chromosomes and that they regulate chromosome cohesion differently. We investigated whether the information that dictates the division type of the chromosome comes from the whole cell, the spindle, or the chromosome itself. Also, we determined when chromosomes can switch from meiosis I behavior to meiosis II behavior. We used a micromanipulation needle to fuse grasshopper spermatocytes in meiosis I to spermatocytes in meiosis II, and to move chromosomes from one spindle to the other. Chromosomes placed on spindles of a different meiotic division always behaved as they would have on their native spindle; e.g., a meiosis I chromosome attached to a meiosis II spindle in its normal fashion and sister chromatids moved together to the same spindle pole. We also showed that meiosis I chromosomes become competent meiosis II chromosomes in anaphase of meiosis I, but not before. The patterns for attachment to the spindle and regulation of cohesion are built into the chromosome itself. These results suggest that regulation of chromosome cohesion may be linked to differences in the arrangement of kinetochores in the two meiotic divisions.
In which phase do the chromosomes coil and become short and thick?
Prophase is inside the nucleus the chromosomes get short and thick and as they coil up become visible as pairs attached by the centromere. The centromere is joined to special proteins to from the kinetochore.
Why do the chromosomes become easier to see under the microscope just before mitosis?
during mitosis and meiosis because the condensed chromosomes are thicker and therefore more prominent.
What stage are Chromosomes duplicated?
technically the chromosomes copy during interphase right before metaphase I of meiosis I so during Meiosis I the chromosomes are duplicated and not until metaphase II during meiosis II are the sister chromatids separated.
How many haploid daughter nuclei are produced by meiosis?
Four polar bodies, though not all become gametes. In males all become sperm, but in females only one becomes an egg.
During meiosis the chromatids become daughter chromosomes during which stage?
Anaphase 2
What is one of the two strands of a chromosomes that become visible during meiosis or mitosis?
daughter strands
When do the chromosomes become duplicated?
Chromosomes become duplicated during meiosis. This is the process of replicating sex cells, otherwise known as gametes. This is how humans create new sex cells for reproduction.
Why do sexual reproductiong organism needs both mitosis and meiosis?
Meiosis is also termed as reduction division. first the diploid(2n) gamete undergoes meiosis to become haploid(1n) then fertilization takes place. For growth and development mitosis is necessary. Meiosis is needed to half the chromosomes number . For example in human there are 46 chromosomes. if fertilization takes place without meiosis then the resulting organism would have 92 chromosomes which off course will not be a human!
What is the change in chromosome number in meiosis?
The Reduction of Chromosome Number in Meiosis Is Determined by Properties Built into the Chromosomes. In meiosis I, two chromatids move to each spindle pole. Then, in meiosis II, the two are distributed, one to each future gamete. This requires that meiosis I chromosomes attach to the spindle differently than meiosis II chromosomes and that they regulate chromosome cohesion differently. We investigated whether the information that dictates the division type of the chromosome comes from the whole cell, the spindle, or the chromosome itself. Also, we determined when chromosomes can switch from meiosis I behavior to meiosis II behavior. We used a micromanipulation needle to fuse grasshopper spermatocytes in meiosis I to spermatocytes in meiosis II, and to move chromosomes from one spindle to the other. Chromosomes placed on spindles of a different meiotic division always behaved as they would have on their native spindle; e.g., a meiosis I chromosome attached to a meiosis II spindle in its normal fashion and sister chromatids moved together to the same spindle pole. We also showed that meiosis I chromosomes become competent meiosis II chromosomes in anaphase of meiosis I, but not before. The patterns for attachment to the spindle and regulation of cohesion are built into the chromosome itself. These results suggest that regulation of chromosome cohesion may be linked to differences in the arrangement of kinetochores in the two meiotic divisions.
In which phase do the chromosomes coil and become short and thick?
Prophase is inside the nucleus the chromosomes get short and thick and as they coil up become visible as pairs attached by the centromere. The centromere is joined to special proteins to from the kinetochore.
Why do the chromosomes become easier to see under the microscope just before mitosis?
during mitosis and meiosis because the condensed chromosomes are thicker and therefore more prominent.
What stage are Chromosomes duplicated?
technically the chromosomes copy during interphase right before metaphase I of meiosis I so during Meiosis I the chromosomes are duplicated and not until metaphase II during meiosis II are the sister chromatids separated.
How many haploid daughter nuclei are produced by meiosis?
Four polar bodies, though not all become gametes. In males all become sperm, but in females only one becomes an egg.
Explain how the chromosomes number is reduced from diploid to haploid through the stages of meiosis?
During meiosis, the number of chromosomes in a cell are split in half so that each daughter cell becomes haploid. This means that given 2n chromosomes, after meiosis I, each cell has 2n chromatids, or n chromosomes. After anaphase II, each daughter cell ends up with n chromosomes, each made up of 1 chromatid. Rearrangement is the process that ensures genetic diversity, which allows for crossover and independent assortment during prophase I.
What is the result of meiosis?
Meiosis happens in the reproductive cells. After the first division you get 2 cells with 46 chromosomes, after the second division, you get 4 cells with 23 chromosomes. In humans at least. These cells will become the sperm cells in males. In females, only one cell of 23 chromosomes becomes an egg, the other 3 are called polar bodies and are reabsorbed into the body basically.
What is the phase in meiosis?
The longest phase in meiosis is Meiosis 1.
