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During crossing-over what happens to portions of chromatids?
During crossing-over, portions of chromatids exchange genetic material with their homologous chromatids. This results in genetic recombination, where genes are shuffled and new combinations of alleles are created, increasing genetic diversity.
What happens in the tetrad stage?
During the tetrad stage of meiosis, homologous chromosomes line up in pairs and exchange genetic material through a process called crossing over. This increases genetic variation in the daughter cells. Subsequently, the pairs of homologous chromosomes separate and move to opposite poles of the cell during meiosis I.
Why is duplication of chromosomes necessary for mitosis?
Considering the following situation: A cell has 2n of DNA, and divides. The two cells that formed each have n amount of DNA. They divide and the four cells that form now have 1/2n. If this continues, there would be almost no DNA left after the trillions of divisions required to produce a complex organism.Another scenario: A cell divides and each cell receives n amount of DNA, and then duplicates the DNA and divides again. The resulting cells will only have only certain portions of the full genome.So that each daughter cell gets a complete genetic complement.
What must a bacterial cell have in order to transfer portions of its chromosome to another cell?
A bacterial cell must have a conjugative plasmid, which contains genes for the transfer of DNA, in order to transfer portions of its chromosome to another cell. Conjugative plasmids encode transfer functions that enable the formation of a conjugation bridge between donor and recipient cells, allowing the exchange of genetic material.
Some portions of chromosomes are condensed and DNA is not expressed these dark-stained areas are called?
These condensed regions are called heterochromatin. This tightly packed DNA is less accessible for gene expression compared to euchromatin, which is less condensed and more transcriptionally active. Heterochromatin plays a role in maintaining chromosome structure and gene regulation.
During crossing-over what happens to portions of chromatids?
During crossing-over, portions of chromatids exchange genetic material with their homologous chromatids. This results in genetic recombination, where genes are shuffled and new combinations of alleles are created, increasing genetic diversity.
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?
This is called genetic recombination or crossing over. It results in the exchange of genetic material between homologous chromosomes during meiosis, leading to genetic diversity in offspring.
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 happens in the tetrad stage?
During the tetrad stage of meiosis, homologous chromosomes line up in pairs and exchange genetic material through a process called crossing over. This increases genetic variation in the daughter cells. Subsequently, the pairs of homologous chromosomes separate and move to opposite poles of the cell during meiosis I.
The two identical portions that are attached by their centromere are known as?
The two identical portions that are attached by their centromere are known as sister chromatids. They are produced during DNA replication and are separated during cell division.
What is a chromosome has been duplicated the two indentical portions that are attached by their centromere?
A duplicated chromosome, with two identical portions attached by their centromere, is referred to as a sister chromatid. Sister chromatids are produced during DNA replication and are important for ensuring accurate distribution of genetic material during cell division.
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 DNA, which carries the genetic information that determines an organism's traits and characteristics. They also contain proteins that help in regulating gene expression and packaging the DNA into a compact structure.
What is the definition of recombination of genetic material?
DNA recombination refers to the phenomenon whereby two parental strands of DNA are tied together resulting in an exchange of portions of their respective strands. DNA recombination results in the process leads to new molecules of DNA that contain a mix of genetic information from each parental strand. There are 3 main forms of genetic recombination. i. Homologous recombination ii. Site-specific recombination iii. Transposition www.examville.com
