Polyploidy canoccur when an error during meiosis leads to the production of unreduced (i.e., diploid) gametes rather than haploid ones, as shown in Figure 6.1. If two diploid gametes fuse, an autotetraploid will be created whose nucleus contains four copies of each chromosome....
When mitotic DNA replication in somatic cells is not followed by cell division (a process called endoreduplication), variation of cellular ploidy levels (designated as somatic polyploidy or endopolyploidy) can result [1]. Endopolyploidy is considered to be developmentally regulated [2] and has ...
How can genetic drift cause microevolution? What is the result when two populations no longer interbreed? What is polyploid hybrid speciation? What causes microevolution? How does coevolution lead to speciation? How does convergent evolution enable plants to leave more descendants? How does synapsis...
People may refer to polyploidy as whole genome duplication, emphasizing that it involves an entire extra copy of the genome. All of the copies of the genome can play against each other when it comes to the expression of genes, which is one reason why some plant species are so diverse and...
Speciation is a process in evolution where new species can develop into new beings. During speciation, species separate from their groups and develop unique characteristics different from the others. Answer and Explanation:1 Polyploidy occurs when an organism has more than two...
Allopolyploidy can result from hybridization of two closely related species, possibly leading to sterile hybrids, because chromosomes can not synapse (pair) during meiosis because they are not similar enough. However, when the newly combined genome undergoes a chromosomal doubling, two identical sets ...
Numerical anomalies can result in either aneuploidy or polyploidy. Aneuploidy is loss or gain of one or, rarely, two chromosomes, exemplified by trisomy 21 or monosomy X. Polyploidy is the addition of a complete haploid, as in 69,XXX, or 69,XYY. Structural anomalies are rearrangements of ge...
7) Fertile haploids produce a large percentage of cytologically unreduced gametes, and when selfed or fertilized by facultative apomictic tetraploids can give rise to fully sexual tetraploids. 8) Diploid races of tetraploid agamospecies are rare, but wherever present, the agamospecies are ...
Be specific how this mechanism gives this result, when it occurs during the cell cycle, and be specific as to the type of genetic variation produced (from base-pair sequ Explain how adaptation to a new niche can drive speciation. Describe how sexual reproduction promot...
On the contrary, cells undergoing endomitosis execute an abortive mitosis that does not result in cell division, followed by subsequent reentering into the S phase. Both types of endoreplication can occur in cancer cells [7]. Recently, it was proposed that tumor cells containing an elevated ...