High college Biology assist » cell Biology » Cell division » Meiosis » knowledge Crossing over
Explanation:

During prophase ns homologous chromosomes will certainly line up through one another, forming tetrads. During this lining up, DNA sequences have the right to be exchanged in between the homologous chromosomes. This form of genetic recombination is referred to as crossing over, and allows the daughter cells of meiosis to be genetically distinctive from one another.

You are watching: What is the process in which homologous chromosomes wrap around each other and exchange dna?

Crossing over deserve to only occur between homologous chromosomes. Cells come to be haploid ~ meiosis I, and can no much longer perform crossing over.


Explanation:

Crossing over is a procedure that happens in between homologous chromosomes in order come increase hereditary diversity. During crossing over, part of one chromosome is exchanged v another. The result is a hybrid chromosome through a unique pattern of hereditary material. Gametes obtain the capability to it is in genetically various from their bordering gametes after crossing over occurs. This enables for hereditary diversity, i m sorry will aid cells take part in survive of the fittest and evolution.


Explanation:

When chromatids "cross over," homologous chromosomes profession pieces of hereditary material, causing novel combinations of alleles, though the very same genes room 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, only sister chromatids remain and also homologous chromosomes have actually been moved to separate cells. Recall the the point of crossing end is to increase hereditary diversity. If crossing end did not occur until sometime throughout meiosis II, sisters chromatids, which room identical, would be exchanging alleles. Because these chromatids space identical, this swap of product would no actually adjust the alleles that the chromatids.


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Example question #4 : expertise Crossing end


What structures exchange hereditary material during crossing over?


Possible Answers:

Egg and also sperm chromosomes


Sister chromatids


Nonsister chromatids


Non-homologous chromosomes


Correct answer:

Nonsister chromatids


Explanation:

During crossing over, homologous chromosomes come together in bespeak to kind a tetrad. This close contact permits the nonsister chromatids indigenous homolgous chromosomes to attach to one another and exchange nucleotide sequences. The word "nonsister" means that the chromatids have the very same genes, yet are not exact duplicates of one another, as they come from different chromosomes.


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Example question #5 : expertise Crossing over


Crossover of homologous chromosomes in meiosis occurs throughout which phase?


Possible Answers:

Prophase II of meiosis


Anaphase i of meiosis


Prophase ns of meiosis


Anaphase II of meiosis


Correct answer:

Prophase i of meiosis


Explanation:

The crossing end of homologous chromosomes wake up in prophase i of meiosis. Prophase ns of meiosis is characterized by the lining up of homologous chromosomes close together to type a structure well-known as a tetrad. A tetrad is created of four chromatids.

Anaphase i is marked by the separation the homologous chromosomes, vice versa, in anaphase II there is the separation of sister chromatids. In anaphase ns sister chromatids are still intact and connected in ~ the centromere. Prophase II is similar to prophase in mitosis in that there is the failure of the nuclear membrane and also the development of spindle fibers in ready for the separation the sister chromatids.


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Example inquiry #6 : knowledge Crossing end


During crossing over, 2 homologous chromosomes pair to type which that the following choices?


Possible Answers:

Tetrad


Base Pair


Chromatid


None that these


Mitotic Bond


Correct answer:

Tetrad


Explanation:

The tetrad, i beg your pardon divides right into non-sister chromatids, exchanges hereditary information in bespeak to make the hereditary pool more variant, and result in combine of phenotypic characteristics that have the right to occur external of attached genotypic coding.


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Example inquiry #7 : understanding Crossing end


Chromosomal crossover occurs in which phase of meiosis?


Possible Answers:

Anaphase II


Metaphase I


Prophase II


Prophase I


Anaphase I


Correct answer:

Prophase I


Explanation:

During prophase I, homologous chromosomes pair with each other and also exchange hereditary material in a procedure called chromosomal crossover. The exchange occurs in segments over a small region of homology (similarity in sequence, ie., the very same alleles). The brand-new combinations the DNA created during crossover carry out a significant source of hereditary variation.


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Example inquiry #8 : expertise Crossing end


Crossing end is a phenomenon that happens throughout Meiosis i in the attempt to develop genetic diversity. Cross over frequently occurs in between which the the adhering to structures?


Possible Answers:

Tetrads


Sister chromatids


Homologous chromosomes


Chromatin


Correct answer:

Homologous chromosomes


Explanation:

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


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Example inquiry #9 : understanding Crossing end


When in meiosis does crossing over occur?


Possible Answers:

Interphase


Prophase I


Telophase I


Anaphase I


Metaphase I


Correct answer:

Prophase I


Explanation:

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


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