In nature, such genes exist in several different forms and are therefore said to have "'multiple alleles " '.
12.
The Dilute mutation is one of a series of multiple alleles at the same Greywing ( " dil gw " ) mutations.
13.
Morgan and his students eventually elucidated many basic principles of heredity, including sex-linked inheritance, epistasis, multiple alleles, and gene mapping.
14.
The TILLING method relies on the formation of DNA heteroduplexes that are formed when multiple alleles are amplified by PCR and are then heated and slowly cooled.
15.
Her group found that in female platypuses, some X-linked genes only expressed an allele from one X chromosomes, while other genes expressed multiple alleles.
16.
Consequently, weak selection provides a model for describing how evolution can occur in large steps in a population in which multiple alleles are maintained [ 1 ].
17.
In 50 % of female platypus cells, only one of the alleles on these X chromosomes is expressed while in the remaining 50 % multiple alleles are expressed.
18.
So although he was incorrect to theorize that there was only one gene involved, the principle that a single gene can have multiple alleles, a revolutionary idea at the time, has proven true.
19.
In other words, Hurford explains the existence of a critical period with genetic drift, the idea that when there are no selection pressures on multiple alleles acting on the same trait, one of the alleles will gradually diminish through evolution.
20.
His accomplishments at Wisconsin included a general model for genetic drift, which could accommodate multiple alleles, selection, migration, and mutations, as well as some work based on R . A . Fisher's fundamental theorem of natural selection.
