High institution Biology assist » cell Biology » Cell division » Meiosis » understanding Crossing end
Explanation:

During prophase ns homologous chromosomes will line up through one another, developing tetrads. During this lining up, DNA sequences can be exchanged in between the homologous chromosomes. This form of hereditary recombination is dubbed crossing over, and allows the daughter cells of meiosis to be genetically distinct from one another.

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Crossing over can only occur between homologous chromosomes. Cells end up being haploid ~ meiosis I, and can no much longer perform crossing over.


Explanation:

Crossing end is a process that happens between homologous chromosomes in order to increase hereditary diversity. During crossing over, component of one chromosome is exchanged v another. The an outcome is a hybrid chromosome with a distinctive pattern of hereditary material. Gametes get the ability to it is in genetically different from their neighboring gametes after crossing end occurs. This allows for hereditary diversity, i beg your pardon will aid cells take part in survive of the fittest and evolution.


Explanation:

When chromatids "cross over," homologous chromosomes trade pieces of genetic material, leading to novel combinations of alleles, despite the same genes space still present. Crossing end occurs during prophase i of meiosis prior to tetrads room aligned follow me the equator in metaphase I.

By meiosis II, just sister chromatids remain and also homologous chromosomes have been relocated to separate cells. Recall that the suggest of crossing over is to increase hereditary diversity. If crossing end did not occur until sometime during meiosis II, sister chromatids, which room identical, would be exchanging alleles. Since these chromatids are identical, this swap of material would not actually adjust the alleles the the chromatids.


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Example inquiry #4 : expertise Crossing end


What frameworks exchange hereditary material during crossing over?


Possible Answers:

Egg and also sperm chromosomes


Sister chromatids


Non-homologous chromosomes


Nonsister chromatids


Correct answer:

Nonsister chromatids


Explanation:

During crossing over, homologous chromosomes come with each other in bespeak to type a tetrad. This close contact allows the nonsister chromatids native homolgous chromosomes to attach to one another and also exchange nucleotide sequences. The word "nonsister" means that the chromatids have actually the very same genes, yet are not exact duplicates of one another, together they come from different chromosomes.


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Example question #5 : expertise Crossing end


Crossover that homologous chromosomes in meiosis occurs during which phase?


Possible Answers:

Prophase ns of meiosis


Anaphase ns of meiosis


Prophase II of meiosis


Anaphase II of meiosis


Correct answer:

Prophase i of meiosis


Explanation:

The crossing over of homologous chromosomes occurs in prophase i of meiosis. Prophase i of meiosis is characterized by the lining up of homologous chromosomes close with each other to type a structure well-known as a tetrad. A tetrad is written of four chromatids.

Anaphase ns is significant by the separation that homologous chromosomes, conversely, in anaphase II over there is the separation that sister chromatids. In anaphase ns sister chromatids are still intact and connected in ~ the centromere. Prophase II is comparable to prophase in mitosis in that there is the breakdown of the atom membrane and also the development of spindle yarn in ready for the separation of sister chromatids.


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Example inquiry #6 : expertise Crossing over


During crossing over, two homologous chromosomes pair to type which of the following choices?


Possible Answers:

Base Pair


Tetrad


Mitotic Bond


None of these


Chromatid


Correct answer:

Tetrad


Explanation:

The tetrad, i m sorry divides right into non-sister chromatids, exchanges genetic information in stimulate to make the hereditary pool an ext variant, and result in combine of phenotypic properties that can occur external of attached genotypic coding.


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Example concern #7 : knowledge Crossing over


Chromosomal crossover occurs in which step of meiosis?


Possible Answers:

Metaphase I


Anaphase I


Anaphase II


Prophase I


Prophase II


Correct answer:

Prophase I


Explanation:

During prophase I, homologous chromosomes pair with each other and exchange hereditary material in a procedure called chromosomal crossover. The exchange wake up in segments over a small an ar of homology (similarity in sequence, ie., the same alleles). The brand-new combinations the DNA created during crossover administer a far-reaching source of hereditary variation.


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Example concern #1 : understanding Crossing over


Crossing over is a phenomenon the happens during Meiosis i in the effort to produce genetic diversity. Crossing over generally occurs in between which that the adhering to structures?


Possible Answers:

Homologous chromosomes


Chromatin


Tetrads


Sister chromatids


Correct answer:

Homologous chromosomes


Explanation:

Crossing end occurs as soon as chromosomal homologs exchange information throughout metaphase the Meiosis I. Throughout this stage, homologous chromosomes heat up on the metaphase plate and exchange hereditary information.

See more: What Is The Climax Of Catcher In The Rye By Ava Garcia, Plot: The Catcher In The Rye By Ava Garcia


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Example inquiry #9 : understanding Crossing end


When in meiosis walk crossing over occur?


Possible Answers:

Anaphase I


Telophase I


Metaphase I


Interphase


Prophase I


Correct answer:

Prophase I


Explanation:

Crossing end occurs throughout prophase I as soon as parts that the homologous chromosomes overlap and switch your genes.


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