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Cytokinesis,
from the greek cyto- (cell) and kinesis (motion, movement), is the process in which the cytoplasm of a single eukaryotic cell is divided to form two daughter cells. It usually initiates during the late stages of mitosis, and sometimes meiosis, splitting a binucleate cell in two, to ensure that chromosome number is maintained from one generation to the next. In animal cells, one notable exception to the normal process of cytokinesis is oogenesis (the creation of an ovum in the ovarian follicle of the ovary), where the ovum takes almost all the cytoplasm and organelles, leaving very little for the resulting polar bodies, which then die. In plant cells, a dividing structure known as the cell plate forms across the centre of the cytoplasm and a new cell wall forms between the two daughter cells.
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In what two ways does meiosis provide genetic variation?
The two sources of genetic variation in a cell during Meiosis are crossing-over during synapse and independent assortment.
What are the advantages of using punnette square?
Punnett squares are helpful for visualizing and predicting possible gene combinations in offspring, making it easier to understand genetic outcomes. They provide a simple way to illustrate genetic inheritance patterns and can be used to calculate the probability of specific traits appearing in offspring. Additionally, Punnett squares can be a useful tool in explaining complex genetic concepts to students or non-experts.
What is the principles of Principles of Heredity?
Principles of Heredity, also known as Mendelian genetics, are based on the principles of segregation, independent assortment, and dominance. These principles describe how traits are inherited from parents to offspring through the passing of genes. They provide the foundation for understanding how genetic information is transmitted from one generation to the next.
Did the discovery of mitosis and meiosis provide a mechanism by which Mendel's principles could operate?
Yes, the discovery of mitosis and meiosis provided a biological mechanism that supports Mendel's principles of inheritance. Mitosis allows for the equal distribution of genetic material during cell division, ensuring that each daughter cell receives the same genetic information. Meiosis, on the other hand, facilitates genetic variation through the segregation and recombination of alleles, aligning with Mendel's laws of segregation and independent assortment. Together, these processes explain how traits are inherited and passed on to the next generation.
What provides the source of variation in evolution?
Mutation, such as insertion, deletion and rarely frameshift mutation. Sexual recombination, is sexually reproducing species. This includes, in meiosis, the independent assortment of chromosomes and crossing over. Then there is random fertilization to provide a last source of variation.
How would crossover affect the rate of evolution?
In humans, independent assortment occurs during meiosis, when the 23 pairs of chromosomes divide into 46 individual chromosomes, and 1 chromosome from each of the 23 pairs goes on to form a gamete (haploid cell) which can then be fertilised to produce offspring. The assortment is "independent" because each of the 23 chromosomes that go on to form a gamete can be from either chromosome within a "pair" - ie the 23 pairs of chromosomes are not linked together in any way when it comes to meiosis. This means that a large number of combinations of genetic material is possible - introducing a random result in the gamete.
Why the combination of alleles called genotype?
A genotype refers to the specific combination of alleles that an individual possesses for a particular gene. These alleles can be dominant or recessive, and their combination determines the individual's traits or phenotype. Genotypes are crucial in understanding inheritance patterns and the genetic basis of traits, as they provide insight into how genetic variation contributes to diversity within a population.
Does polyploidy provide genetic basis in evolution?
no
Can you provide car insurance for your independent son?
Yes
Does asexual reproduction provide for genetic diversity the raw material for evolution?
That answer is false it does not provide gentic diversity.
Natural processes such as speciation and gradualism provide the genetic basis for what?
evolution
What services are provided by Fischer Scientific?
Fischer Scientific provide an assortment of laboratory equipment, supplies, chemicals and services for research, healthcare, safety and science education.
