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Why all organisms show variation?
Variations arise due to recombinations(gene rearrangements) ,mutations etc.The former is the principal source of variation in sexually reproducing organisms and the latter is the source of variation in asexual organisms.According to Darwin variation arises due to chance since all the above mentioned process occur in nature spontanuously all organisms show variation
Does evolution occur at the level of the organisms?
No, organisms die.Evolution is the change in allele frequency over time in a population of organisms.
How is meiosis related to genes?
Meiosis allows a cell to form into 4 cells (by meiosis 1 (which is literally mitosis) and meiosis 2 (mitosis without DNA replication)) in meiosis 1, the cells exchanges DNA information between homologous pairs, this allows genes to be transferred and creates 4 unique and distinct cells. segragation of alleles occur too.
Natural selection cannot occur without what?
Variations within a population. Variations mean traits that only certain individuals have that give the individual a greater or lesser chance of reproducing.
What would happen if there was zero variation between all of the organisms on earth?
Evolution cannot occur.
Does meiosis occur in all growing organisms?
No, meiosis does not occur in all growing organisms. Meiosis is a specialized form of cell division that occurs in sexually reproducing organisms to produce gametes (eggs and sperm). Organisms that reproduce asexually, such as bacteria and some plants, do not undergo meiosis.
In what types of organisms does meiosis occur?
Meiosis occurs in sexually reproducing organisms, including most eukaryotes such as plants, animals, and fungi. It is a process that produces gametes, which are specialized sex cells with half the number of chromosomes as the parent cell.
What will happen if meiosis did not occur in sexually reproducing organisms?
If meiosis did not occur then the chromosome number would double each generation, and the cell could not survive with this increasingly larger number of chromosomes.
When and why does meiosis occur?
Meiosis occurs in sexually-reproducing organisms during the formation of gametes (sperm and egg cells). It is necessary to reduce the chromosome number by half, ensuring that when the gametes combine during fertilization, the resulting offspring will have the correct number of chromosomes.
In sexually reproducing organisms mutations can be inherited if they occur in what in the body?
In sexually reproducing organisms, mutations can be inherited if they occur in the germ cells, which are the reproductive cells (sperm and eggs). These mutations can be passed on to the next generation during fertilization, potentially affecting the offspring's traits. Mutations in somatic cells, on the other hand, do not get passed to future generations.
How can genetic variation be introduced to sexually reproducing organisms?
In organisms that reproduce sexually, each offspring gets half its chromosomes from its mother and half from its father. Therefore, except in the case of monozygous twins, the chances of chromosomally identical siblings are very low.
How do variation occur in asexually reproducing organisms?
Variation in asexually reproducing organisms can occur through mutations, which are random changes in the genetic material. Additionally, genetic recombination can occur through processes like gene transfer, leading to genetic diversity among the offspring. Environmental factors can also play a role in inducing variations in asexually reproducing organisms.
What organism do not have genetic variation?
Organisms that reproduce asexually, such as certain bacteria, archaea, and some plants and fungi, typically exhibit little to no genetic variation. This is because they replicate their genetic material without the process of meiosis, leading to offspring that are genetically identical to the parent. However, mutations can still occur, introducing some level of variation over time. In contrast, sexually reproducing organisms tend to have greater genetic diversity due to the mixing of parental genes.
What advantage does meiosis give to organisms that reproduce sexually?
Meiosis occurs because it provides a way for genetic variability, since it would be unfavorable for an organism's offspring to have the same weaknesses that it did, as opposed to binary fission or mitosis. In mitosis, the parent and daughter cell will be identical if no genetic mutations occur (which most cells have built-in self-repair mechanisms).
What problem would occur in future generations if meiosis did not precede the formation of gametes?
If gametes were not produced then there would be no way of reproducing so the human species would die out.
What would happen if meiosis doesn't occur in sexual reproduction?
Meiosis is the most important biological process in all advanced plants and animals. If this process did not occur, the production of the sex cells would not occur. This is also referred to as a type of chromosome reduction division. Hence, that is how the sexual cells (gametes) have only half the number of chromosomes as the other body cells of that organism. So if meiosis didn't occur, sexual reproduction could not occur.
Explain what the segregation provided by meiosis?
Meiotic segregation of chromosomes occur as a result of pairing up of homologous chromosomes at the inner nuclear membrane. This phenomenon is called Meiotic Bouquet Formation. How this is formed is a big question, but it is recently proved that this is a 'directed motion' by Peter Carlton et al.
