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What is the process where parts of two homologous chromosomes switch places?
Wiki User
∙ 13y ago
This process is called crossing-over.
Wiki User
∙ 13y ago
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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.
How do you cross over?
Crossing over, which occurs during prophase I of meiosis when the homologous pairs of chromosomes pair up, results in the non-sister chromatids of the homologous pairs of chromosomes exchanging pieces of chromosomes (DNA), so that each chromatid will have a combination of the mother's and the father's chromosomes. This results in genetic recombination and increases genetic diversity.
Chromosomers from tetrads during?
The tetrad is a structure that only exists during the late stages of Prophase I and early stages of Metaphase I in Mieosis I. Prior to being sent off to different cells, the homologous chromosomes clump together in these units called tetrads consisting of 2 chromosomes and 4 chromatids. Corresponding parts of the 2 homologous chromosomes are able to switch with each other during this state in a process known as crossing over. It is this crossing over that allows for their to be a wide genetic variation in all the gametes produced after meiosis. If this process did not occur, all chromosomes would be identical from generation to generation aside from the occasional mutation. The fact that it does happen however allows for a wide range of genetic variation in a species, letting traits exchange between different populations. If the traits are beneficial, those that receive them will be more likely to survive and reproduce again. If instead they are detrimental, those unlucky enough to inherit them will lose at natural selection and their bad genes will eventually disappear from the population.
What is the difference between process switch and mode switch?
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How do you think crossing over affects the number of different types of gametes that are formed?
You get four choices of gene, of which two are randomly selected. Although sometimes these genes are the same, often they are not all identical. this results in different genotypes and therefore phenotypes being experienced.
How does crossing over and nondisjunction contribute to variation and increase genetic diversity in a population?
Crossing over is when two homologous chromosomes switch genes. This causes them to become different. Nondisjunction is when there is an incorrect splitting of a chromosome. These two types of variation result in a different set of genes each time an egg and a sperm collide by chance,
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No...
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