High school Biology aid » cabinet Biology » Cell department » Meiosis » understanding Crossing over
Explanation:

During prophase ns homologous chromosomes will certainly line up v one another, forming tetrads. Throughout this lining up, DNA sequences can be exchanged between the homologous chromosomes. This form of hereditary recombination is referred to as crossing over, and enables the daughter cell of meiosis to it is in genetically distinct from one another.

You are watching: Which of the following occurs during prophase

Crossing over deserve to only occur between homologous chromosomes. Cells end up being haploid after meiosis I, and can no much longer perform cross over.


Explanation:

Crossing end is a procedure that happens between homologous chromosomes in order come increase hereditary diversity. During crossing over, component of one chromosome is exchanged through another. The result is a hybrid chromosome through a distinct pattern of hereditary material. Gametes gain the capability to be genetically various from their neighboring gametes after crossing end occurs. This allows for hereditary diversity, i beg your pardon will assist cells get involved in survival of the fittest and also evolution.


Explanation:

When chromatids "cross over," homologous chromosomes profession pieces of genetic material, causing novel combine of alleles, though the same genes are still present. Crossing end occurs during prophase i of meiosis before tetrads are aligned along the equator in metaphase I.

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


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Example inquiry #4 : expertise Crossing over


What frameworks exchange hereditary material throughout 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 enables the nonsister chromatids from homolgous chromosomes to affix to one another and also exchange nucleotide sequences. Words "nonsister" indicates that the chromatids have the very same genes, however are not exact duplicates of one another, together they come from different chromosomes.


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Example concern #5 : knowledge Crossing end


Crossover of homologous chromosomes in meiosis occurs during which phase?


Possible Answers:

Prophase II of meiosis


Anaphase i of meiosis


Prophase i of meiosis


Anaphase II of meiosis


Correct answer:

Prophase i of meiosis


Explanation:

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

Anaphase ns is marked by the separation the homologous chromosomes, whereas in anaphase II there is the separation the sister chromatids. In anaphase ns sister chromatids are still intact and also connected at the centromere. Prophase II is comparable to prophase in mitosis in that there is the failure of the nuclear membrane and the formation of spindle yarn in preparation for the separation that sister chromatids.


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Example question #6 : expertise Crossing over


During cross over, two homologous chromosomes pair to type which of the complying with choices?


Possible Answers:

Tetrad


Base Pair


Chromatid


None the these


Mitotic Bond


Correct answer:

Tetrad


Explanation:

The tetrad, i beg your pardon divides into non-sister chromatids, exchanges hereditary information in order to make the genetic pool more variant, and an outcome in combinations of phenotypic properties that deserve to occur external of attached genotypic coding.


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Example inquiry #7 : understanding Crossing end


Chromosomal crossover occurs in which step 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 through each other and also exchange hereditary material in a procedure called chromosomal crossover. The exchange wake up in segments over a small region of homology (similarity in sequence, ie., the same alleles). The brand-new combinations the DNA produced during crossover provide a far-ranging source of hereditary variation.


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Example concern #8 : understanding Crossing over


Crossing over is a phenomenon that happens throughout Meiosis i in the effort to produce genetic diversity. Cross over commonly occurs in between which of 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 ~ above the metaphase plate and also exchange genetic information.


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Example inquiry #9 : understanding Crossing over


When in meiosis does crossing end occur?


Possible Answers:

Interphase


Prophase I


Telophase I


Anaphase I


Metaphase I


Correct answer:

Prophase I


Explanation:

Crossing end occurs during prophase I as soon as parts of the homologous chromosomes overlap and switch their genes.


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