High institution Biology help » cabinet Biology » Cell division » Meiosis » expertise Crossing end
Explanation:

During prophase ns homologous chromosomes will certainly line up v one another, creating tetrads. During this lining up, DNA sequences have the right to be exchanged between the homologous chromosomes. This type of genetic recombination is dubbed crossing over, and permits the daughter cell of meiosis to it is in genetically distinct from one another.

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Crossing over have the right to only occur between homologous chromosomes. Cells end up being haploid after ~ meiosis I, and can no longer perform crossing over.


Explanation:

Crossing end is a process that happens between homologous chromosomes in order come increase genetic diversity. During crossing over, component of one chromosome is exchanged through another. The result is a hybrid chromosome with a distinctive pattern of genetic material. Gametes acquire the capability to it is in genetically different from their neighboring gametes after crossing end occurs. This enables for hereditary diversity, which will aid cells get involved in survival of the fittest and evolution.


Explanation:

When chromatids "cross over," homologous chromosomes trade pieces of hereditary material, leading to novel combine of alleles, though the same genes space still present. Crossing end occurs during prophase i of meiosis prior to tetrads are aligned along the equator in metaphase I.

By meiosis II, just sister chromatids remain and also homologous chromosomes have been relocated to different cells. Recall that the point of crossing end is come increase hereditary diversity. If crossing over did not occur until sometime during meiosis II, sister chromatids, which are identical, would be exchanging alleles. Due to the fact that these chromatids are identical, this swap of product would not actually change the alleles of the chromatids.


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Example inquiry #4 : understanding Crossing over


What structures 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 order to type a tetrad. This nearby contact permits the nonsister chromatids indigenous homolgous chromosomes to connect to one another and also exchange nucleotide sequences. Words "nonsister" implies that the chromatids have the exact same genes, however are not exact duplicates of one another, as they come from different chromosomes.


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Example concern #1 : knowledge Crossing over


Crossover the homologous chromosomes in meiosis occurs during which phase?


Possible Answers:

Anaphase ns of meiosis


Prophase i of meiosis


Prophase II the meiosis


Anaphase II the meiosis


Correct answer:

Prophase ns of meiosis


Explanation:

The crossing over of homologous chromosomes occurs in prophase i of meiosis. Prophase ns of meiosis is identified by the lining increase of homologous chromosomes close together to form a structure well-known as a tetrad. A tetrad is created of 4 chromatids.

Anaphase ns is significant by the separation of homologous chromosomes, conversely, in anaphase II there is the separation the sister chromatids. In anaphase ns sister chromatids space still intact and connected at the centromere. Prophase II is similar to prophase in mitosis in the there is the breakdown of the nuclear membrane and the development of spindle fibers in preparation for the separation that sister chromatids.


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Example question #6 : expertise Crossing end


During cross over, 2 homologous chromosomes pair to type which of the following choices?


Possible Answers:

Base Pair


Tetrad


Mitotic Bond


None the these


Chromatid


Correct answer:

Tetrad


Explanation:

The tetrad, which divides into non-sister chromatids, exchanges genetic information in bespeak to do the hereditary pool more variant, and an outcome in combine of phenotypic properties that deserve to occur outside of connected genotypic coding.


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Example concern #7 : understanding Crossing end


Chromosomal crossover occurs in which phase 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 also exchange genetic 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 very same alleles). The brand-new combinations of DNA developed during crossover provide a far-reaching source of genetic variation.


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Example concern #1 : expertise Crossing over


Crossing over is a phenomenon that happens during Meiosis ns in the attempt to produce genetic diversity. Cross over typically occurs between which that the complying with structures?


Possible Answers:

Homologous chromosomes


Chromatin


Tetrads


Sister chromatids


Correct answer:

Homologous chromosomes


Explanation:

Crossing over occurs as soon as chromosomal homologs exchange information during metaphase that Meiosis I. Throughout this stage, homologous chromosomes line up ~ above the metaphase plate and also exchange hereditary information.


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Example question #9 : knowledge Crossing over


When in meiosis walk crossing end occur?


Possible Answers:

Anaphase I


Telophase I


Metaphase I


Interphase


Prophase I


Correct answer:

Prophase I


Explanation:

Crossing end occurs during prophase I once parts of the homologous chromosomes overlap and switch your genes.

See more: What Characteristic Of Temperate Rainforests Makes Reproduction Easier For Mosses And Ferns?


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