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What is a process in which homologous chromosomes exchange portions of their chromatids during meiosis?
Wiki User
∙ 12y ago
the process in which homologous chromosomes exchange portions of their chromatids during meiosis is the definition of the term "Crossing Over"
Wiki User
∙ 13y ago
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During crossing-over what happens to portions of chromatids?
breaks off and attach to adjacent chromatids on the homologous chromosome
Some portions of chromosomes are condensed and DNA is not expressed these dark-stained areas are called?
Heterochromatin is dark stained area caused by condensed chromosomes or DNA. Heterochromatin is located near between the inner membrane and the nucleoplasm.
What happens in the tetrad stage?
During the tetrad stage, the metaphase I of meiosis starts to happen. When this occurs, the diploid meiocyte divides twice.
How does asexual reproduction compare with sexual reproduction?
Asexual reproduction only involves mitosis, or binary fission. This leads to clones with identical genotypes. This also results in low genetic variation within a species. Sexual reproduction uses meiosis, indeed, sexual reproduction is the only function of meiosis. In meiosis, the first step causing variation is called Crossing-Over, where portions of the paternal chromosomes and maternal chromosomes physically change places. Next, the cell divides, each daughter cell taking half the chromosomes. These haploid cells now have half the normal chromosome number (23 for humans), but the chromosomes are still in the commonly seen cross shape with two sister chromatids. These now divide again, the chromosome number is still 23, but they are now in their single-strip form. The result is four daughter cells with half the chromosomes of the original cell, and lots of variation. Add to this the randomness if which human mates with which, and which sperm combines with which egg, and one can see how we've been able to keep up, evolutionarily, with bacteria.
The use of sandpaper and brushes to remove the epidermis and portions of the dermis is called what?
The use of sandpaper and brushes to remove the epidermis and portions of the dermis is called dermabrasion.
During crossing-over what happens to portions of chromatids?
breaks off and attach to adjacent chromatids on the homologous chromosome
What happends when corresponding portions of chromatids on two homologous chromosomes change places?
crossing over.
When corresponding portions of chromatids on two homologous chromosomes change places what has occured?
crossing-over
What is homologous chromosomes frequently exchange portions of their DNA called?
It's called crossing over, and it generally only happens between homologous chromosomes.
What crosses over during crossing over?
Each chromatid can synapse with any one it want/chooses.
The diagram below illustrates which type of chromosomes that may cross over and exchange portions of their chromatids during meiosis?
what type of cell has two sets of chromosomes
What is a chromosome has been duplicated the two indentical portions that are attached by their centromere?
Sister Chromatids
The two identical portions that are attached by their centromere are known as?
cromatids b for Plato students
Once a chromosome has been duplicated the two identical portions that are attched by their centromere are know as what?
chromatids.
What do chromosome contain?
Chromosomes contain genes, regulatory portions, the centromere, the telomere and "junk DNA".
Some portions of chromosomes are condensed and DNA is not expressed these dark-stained areas are called?
Heterochromatin is dark stained area caused by condensed chromosomes or DNA. Heterochromatin is located near between the inner membrane and the nucleoplasm.
What happens in the tetrad stage?
During the tetrad stage, the metaphase I of meiosis starts to happen. When this occurs, the diploid meiocyte divides twice.
