Crossing over in meiosis results in genetic recombination, which is responsible for the genetic diversity of a population. Genetic recombination and natural selection are the driving forces behind evolution. It causes most of the differences between parents and their offspring and differences between siblings.Know More
Meiosis, otherwise known as sex cell division, creates unique gametes, which are eggs in females or sperm in males, from existing DNA in eukaryotes. For meiosis to occur, the chromosomes contributed by each of the organism's parents are duplicated to form sister chromatids. During meiosis I, the sister chromatids of one parent match up with the corresponding sister chromatids of the other parent, or its homologous non-sister chromosome, along the metaphase plate. Crossing over then occurs. At a point called a chiasma, homologous chromosomes trade genetic information so that each chromosome is complete but has different information. This random exchange of information is what allows for unique gametes to form and genetic recombination to occur.
Sometimes, however, too few crossing over events can result in abnormally short or long chromosomes, meaning that there is too little or too much information. If a gamete with this type of chromosome is fertilized, abnormalities in the offspring are likely.Learn More
The mitochondria inside a cell produces ATP, or adenosine triphosphate. Cellular respiration is responsible for ATP production, a process in which ATP production occurs after biochemical energy from nutrients is converted.Full Answer >
The simplified reaction for aerobic cellular respiration is: C6H12O6 (s) + 6 O2 (g) ? 6 CO2 (g) + 6 H2O (l) + energy. The process of cellular respiration uses one molecule of glucose and, in the presence of molecular oxygen, turns it into adenosine triphosphate.Full Answer >
The best analogy for the nucleolus in eukaryotic cells is a factory that makes tools that are used to build other resources. The primary function of the nucleolus is to combine and construct ribosomes. The primary function of ribosomes is to build proteins necessary for the cell.Full Answer >
An electron is a negatively charged subatomic particle that orbits around the nucleus of an atom. The negative charge of the electrons is balanced by the positive charge of the protons in the nucleus. Electrons have a much lower mass than protons.Full Answer >