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8 votes
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How do gene locations change during crossing over events?

It depends on the regions of sequence homology between the two chromosomes. Crossing over occurs through pairing of homologous regions. If there's a substantial stretch of chromosome without a ...
Armand's user avatar
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3 votes
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Why does chromosome inversion happen?

Why does inversion happen? What is its purpose? Like many other mutations, inversion is generally a neutral mutation. Many inversions, especially those which are between small, intergenic regions, ...
another 'Homo sapien''s user avatar
2 votes

Does chromosome cross occur over male and female or vice versa?

The question is unclear to me but hopefully that will help a little bit. My understanding is homologous chromosome pair, which means male and female chromosome There is no male and female ...
Remi.b's user avatar
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2 votes
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A diagram of a crossover

I'm not sure if this is what you're asking for, but in the following image, allele K (or k) is linked to B while A (or a) and B are independent. Again, this is just a guess because your question ...
another 'Homo sapien''s user avatar
2 votes

When do 3 germ layers form in embryo? And why is there only one mature egg formed?

I'll bifurcate the question and answer each part one at a time. Germ layer formation: Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered ...
another 'Homo sapien''s user avatar
2 votes
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Crossover Value and Genetic Mapping

As a silly example: Let's say that you are traveling along a road where you know there are bandits and thieves. You want to finish your journey quickly, and spend very little time on the road, ...
Maximilian Press's user avatar
2 votes
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How many of the four meiotic daughter chromosomes of a homologous pair can be recombinant via crossover?

There can be and often is more than one crossover per chromosome in meiosis, but how many crossovers occur can depend on the species, sex, age, environment, and which particular chromosome is ...
tyersome's user avatar
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2 votes

How many generations does it take for the average descendant not to be genetically related to the ancestor?

Graham Coop performed simulations related to this question, based on actual transmission data for each chromosome in humans. He found that after 10 or 11 generations there was >50% chance that any ...
Darlingtonia's user avatar
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1 vote

How many generations does it take for the average descendant not to be genetically related to the ancestor?

Father/Mother, DNA = D Child, $\frac{1}{2} \times D$ Grandchild, $\frac{1}{2}\times \frac{1}{2} \times D= \left(\frac{1}{2}\right)^2 \times D$ Great grandchild, $\left(\frac{1}{2}\right)^3 \times D$ ...
Hudjefa's user avatar
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1 vote

What makes protein binding to the DNA random?

Crossovers during Meiosis are not random in human beings. Its an interesting question as to whether there are organisms that are completely random but the reasons we will discuss here, that is pretty ...
shigeta's user avatar
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1 vote

How random is genetic recombination?

Overall, the crossover locations within a chromosome can be seen as random. More specifically, hot-spots depend on population (Fig 1) and sex (Fig S2) (in human) and can be predicted [1].
KaPy3141's user avatar
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1 vote
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What is the map unit between the genes?

Here's a hint: you're right about 0.01 being the recombinant (crossed-over) double homozygous recessive offspring. I think you're forgetting that each offspring contains 2 gamete haplotypes, and so ...
Armand's user avatar
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1 vote

Crossover Value and Genetic Mapping

There are two main question: (a) dependence of the frequency of recombination with the distance that separates genes and (b) do all crossover events take place with a single break on one chromosome? ...
Luis Sierra's user avatar
1 vote

Can chromosomal crossover undo itself?

That's quite an interesting question. Crossing over occur during meiosis, there can be more than one in a chromosome indeed. Let's say two crossing over occurs in the same chromosome (the one with ...
Untitpoi's user avatar
  • 354
1 vote

Can chromosomal crossover undo itself?

Good thinking. Yes, it is theoretically possible. It is often modelled like this. Have a look at this answer for the maths. Note however, that to my understanding (and I might be wrong) there is ...
Remi.b's user avatar
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1 vote
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Does crossover happen between chromosomes from grandparents?

Your question and your rephrased question aren't asking the same thing, so you may want to edit your question. Crossover occurs during meiosis, which is a type of cell division that occurs in the ...
Bryan Krause's user avatar
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1 vote

Why does crossing over take place at all?

Crossing over is believed to be beneficial for evolution. It does not cause only mutations, it allows for the switching and mixing of genetic information. Thanks to crossing over entire protein ...
alec_djinn's user avatar
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