Why must DNA be packaged into chromosomes before mitosis or meiosis can occur? Why must DNA be packed into chromosomes before mitosis can occur? Why do gametes undergo meiosis? Why do chromosomes condense during prophase? Why is it important for the chromosomes to condense during mitosis?
Why must the DNA be duplicated before cell division? Why are there two separate meiosis stages? Why does asexual reproduction occur in plants? What is the role of mitosis in our bodies? Explain why meiosis is necessary for sexual reproduction. ...
As a result, genetic evidence in Phycomyces showed decades ago that the recombinant progeny are generally consistent with a single meiosis followed by post-meiotic mitoses (Eslava et al., 1975). Thus, although a single nuclear state is never seen, it must occur in Phycomyces, and by ...
Before we can delve into the characteristics of the various recombination pathways, we need to briefly review the early stages of recombination that these pathways share. Recombination starts at the very beginning of meiosis with the formation of DNA double-strand breaks (DSBs) by the transesterase...
However, it is also known to occur in three families in Diptera (true flies): Sciaridae, Cecidomyiidae and Calliphoridae. Here we review current knowledge of monogenic reproduction in these dipteran clades. We discuss how this strange reproductive strategy might evolve, and we consider the potential...
In the iPSC system, binding of the FMR1 mRNA to the genomic repeat does not occur before day 45, implying that the hybrid forms slowly [40]. Thus, the size of a stable hybrid might determine the length at which an open transcription bubble‘sensitizes’ the TNR sensitive to damage (...
3). As meiotic genes are present in all major eukaryotic lineages, meiosis (sex) may have preceded the diversification of basal eukaryotes. The rise in O2 by 2.4 Ga was probably toxic to Archean biota and in synergy with other environmental stresses (reactive oxygen species, desiccation) may ...
occur in humanswhen you change just one amino acid. The extensivelist of fossil sitesfrom around the Earth. Boa constrictorshave hip bones.Domestic Pigs.Domesticated Cows. Alligators and frogstaste like fishy chicken.Male nipples. Tibetanhigh-altitude genes and the Milano mutation. The science of...
one genome from each of the parental species, and this may mess up the normal process of meiosis that forms sperm and eggs. If it gets messed up in hybrids that, without fertilization, eggs can go on to develop into adults (and these eggs must still have two genomes), we have parthenog...
Why is it that when the cell divides in mitosis, it does not form 4 cells, but in meiosis it does? Why are mitosis and meiosis different? When does mitosis occur? When does meiosis occur? Following mitosis, a) how does the chromosome number of the daughter cell compa...