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Can any of the gametes be identical to each other after crossing over took place?
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When somatic cells reproduce by mitosis does crossing over take place?
Yes. However, crossing over occurs much less frequently in somatic cells than in meiotic cells. Evidence of mitotic crossing over is the occurence of twin spots in Drosophila and other organisms.
Which phase of meiosis occurs right after crossing over?
Before crossing over, interphase I takes place. Crossing over occurs during prophase I. Metaphase I occurs after prophase I.
How does meiosis contribute to the variation in a species?
During meiosis crossing over takes place between homologous chromosomes. Thus genetic material get interchanged and 50 % new combinations are obtained after each meiotic cell division. Thus, meiosis brings heritable variation in the gametes.
When does crossing over occur im meiosis?
it takes place in the metaphase
What is meant by '' crossing over'' in terms of cells in your body?
it basically a chromosome that exchange parts and this leads to genetic variation. For example say 2 people where wearing bracelets and one wants what the other one has the, its just an exchange.
What is meant to be segregation when sex cells are produces?
Freedom of genetic characters to move independently from parents to the gametes by the process of crossing over which takes place during meiosis.
Why are new cells identical after budding?
Because budding is a method of asexual reproduction so no crossing over or independant assortment take place.
What is the difference between synapsis and crossing over?
-- synapsis: homologous chromosomes are coming close together and bivalents are formed.-- crossing-over: non-sister chromatids of homologous chromosomes interchange genesThe pairing (formation of bivalents) allows crossing over to take place and this enables genetic variations in the gametes.
Why do you use non-sister chromatids to demonstrate crossing over?
Crossing over occurs between homologous chromosomes, which are not identical, as one member of each pair of homologous chromosomes comes from the mother, and one member comes from the father. Sister chromatids are identical and crossing over would have no effect.
How does sexual reproduction lead to genetic variation in humans?
At prophase I in meiosis the process of independent orientation of chromosomes takes place. Simplified example; one way or the other of the two ways this process take place. XX YY or XY YX Then in this same phase their is crossing over where the male and female chromosomes exchange parts of their chromosomes with each other. Finally, with all these variations of gametes, there is random fertilization where any two male and female gametes join together to form a zygote.
When chromosome pairs separate into different sex cells does the alleles genes stay together?
During meiosis exchange of chromatid takes place by crossing over among the homologous chromosomes and chromatids of two chromosomes facing each other are involved in crossing over. Thus 50% of the gametes formed have new arrangement of alleles and rest 50% remain like those of parent cells.
The production of motile gametes takes place in?
Male Gonads
Where does the production of motile gametes takes place?
male gonads
Why does meiosis take place where does it take place?
It takes place in the sex organs. So it can produce 4 gametes.
Why did they build the Sydney harbor Brudge in the first place?
They needed a crossing from one side of the harbour to the other.
Are sexual reproduced organisms genetically identical to their parents?
No, they are not. Only asexually formed organisms are exactly the same.
Where in the humans would you expect to find meiosis take place?
Gametes
