This is a result of asymmetric segregation of the X chromosome in male meiosis II, which gives rise to XX sperm. As a result, either one or two paternally-derived X chromosomes are eliminated from the embryo, which initiates female (XX) or male (X0) development, respectively (Fig. 1B)...
We have articles on everything from parts of the cell (likenucleotidesand theendoplasmic reticulum) tohow mitosis worksandhow it's different from meiosis. Are there other science topics you want to review? Then you're in luck!Our guides will teach you loads of useful topics, includinghow to...
Sexual reproduction ensuresthat there is high degree of variation within populations. The parent organisms give rise to reproductive cells called gametes. These are formed by a special type of cell division called meiosis. The cells produced in this way has half the normal amount of genetic materia...
For over two decades, the prime objective of the chemical biology community studying G-quadruplexes (G4s) has been to use chemicals to interact with and stabilize G4s in cells to obtain mechanistic interpretations. This strategy has been undoubtedly succ
In particular, the large 'azygospores' that some Glomeromycotina produce are likely to be homologous to zygospores, the site of meiosis in other Mucoromycotina. The problem with these spores is that they are formed from multinuclear hyphae and yield a multinuclear spore – without a single ...
The paper also helps to understand how meiosis, the process that produces sex cells, differs between sperm andeggs. Sperm, the smallest cell in a person's body, form by the billions at temperatures below body temperature and are produced throughout the entire adult lifespan. Eggs, the largest...
Animals that move to a dark environment will quickly lose evolutionary adaptations that are no longer useful. Cave fish embryos begin to develop eyes, but then stop and skin grows over them. Flightless Birds Ostrich Credit:Doug Wheller Similarly to cave fish, the wings of birds that no longer...
At the heart of meiosis is crossover recombination, i.e., reciprocal exchange of chromosome fragments between parental genomes. Surprisingly, in most eukar