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When occurs between nonsister chromatids genetic exchange between chromosomes provides new combinations of genes that are different from the parent cell?
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∙ 11y ago
crossing over
Wiki User
∙ 11y ago
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What are segments of nonsister chromatids that break and reattach to the other chromatid?
sister chromatids
Simplify meiosis into its basic events?
Homologous chromosomes pair up. Nonsister chromatids exchange segments in a process called crossing over. Because alleles etc.
Crossing over occurs in?
Each chromatid can synapse with any one it want/chooses.
What is the significance of meiosis in the formation of haploid gametes and its role in genetic variability?
Here are a few points of that broad question:The process of meiosis creates haploid cells (containing a single chromosome set). It introduces a large amount of variablitilty in offspring through the following:Independant Assortment:During Metaphase I the homologous pairs (consisting of one maternal and one paternal chromosome) are situated at the metaphase plate. Each pair may orient its maternal or paternal homolog closer to either pole. Each of the pairs are positioned independantly, each side have a 50% chance of receiving either maternal or paternal chromosomes.The number of combinations that are possible for daughter cells formed by a diploid cell is 2n (n is the haploid number of an organism, for humans the haploid number is 23)Crossing Over:During Phrophase I homologous chromosomes pair loosely along their lengths and the exchange of two corresponding segments of two nonsister chromatids (one paternal and one maternal) occurs.Different arrangements of nonidentical sister chromatids druing meiosis II increase variability.*Products of meiosis allows for random fertilization*The fusion of a male gamete with a female gamete during fertilization will produce a zygote with any of about 70 TRILLION (223 X 223) diploid combinations.Neil A.Campbell, Jane B. Reece, Biology 8th edition, 2008. Pgs 254-259
What phase of meiosis do nonsister chromatids cross over?
Nonsister Chromatids Cross-over in Prophase 1
What are segments of nonsister chromatids that break and reattach to the other chromatid?
sister chromatids
Simplify meiosis into its basic events?
Homologous chromosomes pair up. Nonsister chromatids exchange segments in a process called crossing over. Because alleles etc.
What is the appearance of two nonsister chromatids following crossing over?
It is important to include what the following is for a person to know the correct answer. With this information missing a person will not know what appearance of the chromatids is.
Describe the two stages in meiosis?
there are actually four stages or phases in meiosis: prophase, metaphase, anaphase and telophase. Within prophase there is the leptotene stage where individual chromosomes condense into strands within the nucleus, the zygotene stage where the chromosomes line up with each other into homologous chromosomes, the pachytene stage where the nonsister chromatids exchange genetic information over regions of homology, the diplotene stage where the chromosomes start to separate and uncoil a little to allow some transcription of DNA, and the diakinesis stage where the chromosomes condense further and the meiotic spindle begins to form.
Crossing over occurs in?
Each chromatid can synapse with any one it want/chooses.
In meiosis what is crossing over?
Crossing over is the exchange of corresponding segments of DNA molecules by nonsister chromotids.
What is the significance of meiosis in the formation of haploid gametes and its role in genetic variability?
Here are a few points of that broad question:The process of meiosis creates haploid cells (containing a single chromosome set). It introduces a large amount of variablitilty in offspring through the following:Independant Assortment:During Metaphase I the homologous pairs (consisting of one maternal and one paternal chromosome) are situated at the metaphase plate. Each pair may orient its maternal or paternal homolog closer to either pole. Each of the pairs are positioned independantly, each side have a 50% chance of receiving either maternal or paternal chromosomes.The number of combinations that are possible for daughter cells formed by a diploid cell is 2n (n is the haploid number of an organism, for humans the haploid number is 23)Crossing Over:During Phrophase I homologous chromosomes pair loosely along their lengths and the exchange of two corresponding segments of two nonsister chromatids (one paternal and one maternal) occurs.Different arrangements of nonidentical sister chromatids druing meiosis II increase variability.*Products of meiosis allows for random fertilization*The fusion of a male gamete with a female gamete during fertilization will produce a zygote with any of about 70 TRILLION (223 X 223) diploid combinations.Neil A.Campbell, Jane B. Reece, Biology 8th edition, 2008. Pgs 254-259
