Search results
Results from the WOW.Com Content Network
James Franklin Crow (January 18, 1916 – January 4, 2012) was Professor Emeritus of Genetics at the University of Wisconsin–Madison and a prominent population geneticist whose career spanned from the modern synthesis to the genomic era.
L1s can further impact genome variation through mispairing and unequal crossing over during meiosis due to its repetitive DNA sequences. [4] L1 gene products are also required by many non-autonomous Alu and SVA SINE retrotransposons.
However, there are several mechanisms that lead to an unequal transmission of parental alleles from parents to offspring. One example is a gene drive complex, called a segregation distorter , that "cheats" during meiosis or gametogenesis and thus is present in more than half of the functional gametes.
Unequal crossing over is the process most responsible for creating regional gene duplications in the genome. [1] Repeated rounds of unequal crossing over cause the homogenization of the two sequences. With the increase in the duplicates, unequal crossing over can lead to dosage imbalance in the genome and can be highly deleterious. [1] [2]
Few other ZZ/ZW Systems have been analyzed as thoroughly as the chicken; however a recent study on silkworms [39] revealed similar levels of unequal compensation across male Z chromosomes. Z-specific genes were over-expressed in males when compared to females, and a few genes had equal expression in both male and female Z chromosomes.
These are labelled in dynamical genetics as dynamic mutations. [1] Triplet expansion is caused by slippage during DNA replication, also known as "copy choice" DNA replication. [ 2 ] Due to the repetitive nature of the DNA sequence in these regions, 'loop out' structures may form during DNA replication while maintaining complementary base ...
In the late 19th and early 20th century, group differences in intelligence were often assumed to be racial in nature. [4] Apart from intelligence tests, research relied on measurements such as brain size or reaction times. By the mid-1940s most psychologists had adopted the view that environmental and cultural factors predominated.
An example in dog coat genetics is the homozygosity with the allele "e e" on the Extension-locus making it impossible to produce any other pigment than pheomelanin. Although the allele "e" is a recessive allele on the extension-locus itself, the presence of two copies leverages the dominance of other coat colour genes.