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It would be wrong to consider mitosis insignificant as it helps in cell repair and replacement in our daily life and it would be impossible to survive without it and asexual reproduction as well but if it weren't for meiosis, none of us would have been born :) Meiosis is responsible for the division for our gamete cells which leads to the formation a zygote. from there on mitosis takes over.
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TaigaCells that divide by meiosis are diploid (2n) to start with, but the cells that are formed from meiosis are haploid (n), as the number of chromosones have halved. This therefore requires two stages: meiosis I and II.
Mitosis produces daughter cells with the same genetic material as the parent, but meiosis is the precursor to sexual reproduction - and the offspring will end up with half the genetic material of each parent.
The recombination of genetic material involved in sexual reproduction produces a much greater variety than mitosis.
Meiosis results in genetic diversity because of the crossing over of homologous chromosomes. Because of crossing over, meiosis results in four non-identical daughter cells. Asexual reproduction produces two daughter cells that are genetically identical to the parent cell and each other.
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When parts of chromosomes are broken off and lost during mitosis or meiosis the result is an?
when parts of chromosomes are broken off and lost during mitosis the results is a chromosomal mutation
During meiosis crossing-over gene exchange between chromosomes may occur Crossing-over usually results in?
The result of crossing over is genetic diversity. More specifically, it is a hybrid chromosome with a unique pattern of genetic material. Does this answer help?
How does variation occur?
Variation or mutation occurs within the DNA. It is a natural result of the replication process, or the copying of one DNA strand to make new DNA during reproduction. If the new mutation ends up making some kind of variation that does not kill the organism, then the variation will be passed on to new generations. This is how new traits are formed. When the variation is actually more useful than a trait that the organism's parents had, that new variation will be passed along as a survival trait.
A change in the genetic material that produces variation in a species may be the result of?
immigration, mutation and sexual reproduction.
What causes many endangered species that are now found only in zoos to have very little genetic variations?
Founder effect refers to the loss of genetic variation when a new colony is established by a very small number of individuals from a larger population. As a result of the loss of genetic variation, the new population may be distinctively different.Bottleneck effect is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing, and the population is reduced by 50% or more, often by several orders of magnitude.Population bottlenecks increase genetic drift, as the rate of drift is inversely proportional to the population size.They also increase inbreeding due to the reduced pool of possible mates.
