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Crossing over and the separation of duplicated homologous chromosomes in the first division produce genetic variation?
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∙ 12y ago
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∙ 12y ago
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Does meiosis have variation?
During meiosis, genetic recombination of homologous chromosomes occurs. So meiosis does result in genetic variation. After prophase I, during which crossing over occurs, every chromosome will have some maternal DNA and some paternal DNA.
Random alignment of chromosomes contribute to genetic variation?
Random alignment of chromosomes occurs during Metaphase I in a cells meiosis. Random alignment is when the homologous pairs of chromosomes line up at the equator or middle of the cell, and are arranged by which member faces what pole. This allows equal opportunity for the chromosomes to migrate to a different cell.
Genetic variation occurs when chromosomes are shuffled in and fertilization?
genetic variation occurs when chromosomes are shuffled in_and fertilization
Meiosis leads to variation in offspring by what?
In prophase of meiosis, first, a stage comes (known as crossing over) in which homologous chromosomes, after pairing, exchagne their genetic material. This is the stage where varition occurs during, and only in, meiosis I.
What is a source of genetic variation that involves the swapping of sections of chromosomes during meiosis.?
What is a source of genetic variation that involves the swapping of sections of chromosomes during meiosis.?
What is a variation of a gene that occurs at the same place on homologous chromosomes?
An allele.
A species has homologous chromosomes. what does this say about the species?
It has pairs of matching chromosomes (APEX)
What is it called when homologous chromosomes trade alleles?
Crossing-over is when segments of homologous chromosomes switch places. This process occurs during prophase I of meiosis and results in recombinant chromosomes. This adds to the variation seen in offspring.
What would happen if homologous chromosomes did not pair in prophase 1?
if homologous chromosomes didn't pair up in Prophase 1 the DNA between the parents isn't distributed equally to the offspring, or variation would not occur.
How is genetic variation among gamete produced during meiosis?
Crossing over when pieces of homologous chromosomes are exchanged
What occurs during prophase 1 of meiosis?
In Prophase I: - The duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. - DNA is exchanged between homologous (similar) chromosomes in a process called 'homologous recombination'. - This often results in the non-sister chromatids crossing over*. The new combinations of DNA created during crossover are a significant source of genetic variation. *at points called chiasmata (plural; singular chiasma).
The process of cell division that creates genetic variety in cells is what?
Genetic variation occurs due to crossing over at prophase 1 and independent assortment of homologous chromosomes at metaphase 1. Both prophase 1 and metaphase 1 are stages of meiosis 1, in which homologous chromosomes are separated.
When do homologues pair?
A homologous pair is a pair of chromosomes that exist in diploid cells. One of the pair you inherit from your father, the other from your mother. A human has 22 pairs of homologous chromosomes (these do not include sex chromosomes). They are the same length and shape. They also share the same genes. The sequences of the genes may be different, which is what results in genetic variation, but the genes are the same.
Does meiosis have variation?
During meiosis, genetic recombination of homologous chromosomes occurs. So meiosis does result in genetic variation. After prophase I, during which crossing over occurs, every chromosome will have some maternal DNA and some paternal DNA.
Random alignment of chromosomes contribute to genetic variation?
Random alignment of chromosomes occurs during Metaphase I in a cells meiosis. Random alignment is when the homologous pairs of chromosomes line up at the equator or middle of the cell, and are arranged by which member faces what pole. This allows equal opportunity for the chromosomes to migrate to a different cell.
Under what circumstances would crossing over during meiosis not contribute to genetic variation among daughter cells?
when homologous chromosomes are the same. also, in the case of a double cross over.
How does meiosis introduce genetic variation in to offspring?
Meiosis produces gametes which then go on to participate in sexual reproduction. Sexual reproduction combines the genetic material of the two parents - therefore creating variation.
