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

During prophase ns homologous chromosomes will line up with one another, forming tetrads. Throughout this lining up, DNA sequences have the right to be exchanged in between the homologous chromosomes. This kind of hereditary recombination is referred to as crossing over, and enables the daughter cells of meiosis to it is in genetically unique from one another.

You are watching: Crossing over normally takes place during which of the following processes?

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


Explanation:

Crossing end is a process that happens in between homologous chromosomes in order to increase hereditary diversity. Throughout crossing over, part of one chromosome is exchanged with another. The an outcome is a hybrid chromosome through a unique pattern of genetic material. Gametes get the capacity to it is in genetically various from their neighboring gametes ~ crossing over occurs. This allows for hereditary diversity, i m sorry will assist cells participate in survive of the fittest and also evolution.


Explanation:

When chromatids "cross over," homologous chromosomes trade pieces of hereditary material, bring about novel combinations of alleles, despite the exact same genes space still present. Crossing over occurs during prophase ns 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 been moved to separate cells. Recall the the suggest of crossing end is to increase genetic diversity. If crossing end did not take place until sometime during meiosis II, sister chromatids, which space identical, would certainly be exchanging alleles. Since these chromatids are identical, this swap of product would no actually change the alleles that the chromatids.


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Example question #2 : expertise Crossing over


What frameworks exchange genetic material throughout crossing over?


Possible Answers:

Non-homologous chromosomes


Sister chromatids


Egg and sperm chromosomes


Nonsister chromatids


Correct answer:

Nonsister chromatids


Explanation:

During crossing over, homologous chromosomes come with each other in stimulate to form a tetrad. This close contact permits the nonsister chromatids from homolgous chromosomes to attach to one another and exchange nucleotide sequences. The word "nonsister" suggests that the chromatids have the exact same genes, but are no exact duplicates of one another, together they come from different chromosomes.


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Example concern #1 : understanding Crossing end


Crossover that homologous chromosomes in meiosis occurs during which phase?


Possible Answers:

Anaphase II the meiosis


Prophase ns of meiosis


Prophase II of meiosis


Anaphase i of meiosis


Correct answer:

Prophase ns of meiosis


Explanation:

The crossing over of homologous chromosomes occurs in prophase ns of meiosis. Prophase i of meiosis is identified by the lining up of homologous chromosomes close with each other to form a structure recognized as a tetrad. A tetrad is created of 4 chromatids.

Anaphase i is significant by the separation the homologous chromosomes, whereas in anaphase II over there is the separation that sister chromatids. In anaphase ns sister chromatids space still intact and also connected in ~ the centromere. Prophase II is similar to prophase in mitosis in that there is the malfunction of the atom membrane and the development of spindle fibers in preparation for the separation that sister chromatids.


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Example inquiry #1 : understanding Crossing end


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


Possible Answers:

Mitotic Bond


None that these


Tetrad


Chromatid


Base Pair


Correct answer:

Tetrad


Explanation:

The tetrad, i beg your pardon divides right into non-sister chromatids, exchanges genetic information in stimulate to do the genetic pool more variant, and an outcome in combine of phenotypic traits that can occur exterior of attached genotypic coding.


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Example inquiry #1 : expertise Crossing over


Chromosomal crossover occurs in which phase of meiosis?


Possible Answers:

Anaphase I


Metaphase I


Prophase I


Anaphase II


Prophase II


Correct answer:

Prophase I


Explanation:

During prophase I, homologous chromosomes pair with each other and exchange genetic material in a process called chromosomal crossover. The exchange occurs in segments end a small an ar of homology (similarity in sequence, ie., the same alleles). The new combinations the DNA produced during crossover administer a far-ranging source of genetic variation.


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Example inquiry #1 : expertise Crossing end


Crossing over is a phenomenon the happens throughout Meiosis ns in the effort to create genetic diversity. Crossing over frequently occurs in between which the the adhering to structures?


Possible Answers:

Chromatin


Tetrads


Homologous chromosomes


Sister chromatids


Correct answer:

Homologous chromosomes


Explanation:

Crossing over occurs when chromosomal homologs exchange information during metaphase the Meiosis I. During this stage, homologous chromosomes heat up top top the metaphase plate and also exchange hereditary information.


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Example concern #1 : understanding Crossing end


When in meiosis go crossing end occur?


Possible Answers:

Metaphase I


Prophase I


Anaphase I


Telophase I


Interphase


Correct answer:

Prophase I


Explanation:

Crossing end occurs throughout prophase I when parts of the homologous chromosomes overlap and also switch their genes.

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