All Questions
Tagged with genetics chromosome
108
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Mechanism of random assortment of chromosomes
How does the random assortment of chromosomes during meiosis occur?
I am a mathematician, not a biologist, and I am surprised that it is difficult to find an answer to this question online (AI ...
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Gene Mapping - Please explain in Lay terms
Taking an AP bio course, and for some reason I cannot comprehend the mechanism of how one determines the location of alleles on a chromosome. The math is simple and I can memorize it, but its bugging ...
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How frequently does recombination occur, and how long are the recombinated fragments?
I understand the mechanics of recombination, but am struggling with the 'scale'.
When two homologous chromosomes pair, roughly how many recombination events occur on average? I understand there will ...
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How to disambiguate between chromosome and chromosome pair?
Our genetic information is stored in 23 pairs of chromosomes that vary widely in size and shape. Chromosome 1 is the largest and is over three times bigger than chromosome 22.
Source: https://www.ncbi....
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Why is There a Necessity for Two Rounds of Cell Division and Four Daughter Cells in Meiosis
Why does meiosis involve two rounds of cell division instead of stopping after meiosis I, where each daughter cell would have one chromosome randomly selected from each pair of homologous chromosomes? ...
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If crossing over did not occur, would pairs of cells after meiosis II have the same genes?
If crossing over did not occur, would there be two pairs of cells with the same chromosomes after meiosis II? This question came to my mind while I was reading through my bio textbook. After meiosis I,...
2
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Maximum number of chromosomes a human can have without dying? [closed]
I know that trisomia of chromosome 21 gives a person the Down's syndrome. Sometimes one can have sex-chromosome trisomia, and it is not apparent until adolescence. Certainly none of those problems ...
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What is the DNA sequences between two Inverted Repeats called?
I would like to know some rules about the nomenclature of Inverted Repeats DNA sequences. More in detail, I want to know what is the name of sequences between two inverted repeats.
For example, I have ...
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Could someone explain how chromosomes are counted here?
I'm not sure how chromosomes are counted in this picture. I would reason that there would be 8 chromosomes in the diploid cell, but that doesn't seem to be the case. Could someone explain?
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How is it determined whether a chromosome is maternal or paternal for imprinting?
For imprinting, how does the cell determine which chromosome is maternal and which is paternal? For example, in the parental imprinting of insulin-like growth factor 2 (Igf2) on chr7 (autosome), how ...
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Why do chromosome pairs have different shapes and sizes?
When I look at microscopic images of human chromosome pairs I see that they have different shapes and sizes.
Is there a deeper biological reason for that? Is there some evolutionary pressure for them ...
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Chromosomal disorders
I was reading about chromosomal disorders and encountered a line stating that
'An individual may lack one of any one pair of chromosomes'
So does it mean that an individual cannot have monosomy of ...
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What is a proximal deletion breakpoint?
I am reading a journal paper about the relationship between NCAM2 and autism. I have come across the following statement in the paper:
Based on analysis utilizing the UCSC Genome Browser (hg18, build ...
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Do we come to know which allele is dominant by seeing family genration tree only?
I know that a Gene has Alleles (variation) and one is Dominant over Other i.e the Other Recessive.
Then I got a Thought that How can we tell whether an Allele is Dominant or Recessive...... and I came ...
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Recombination Data Set
I was looking over some genetics question and came across this data set.
In the fruit fly Drosophila melanogaster there is a dominant gene b+ for grey body color and another dominant gene c+ for ...
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