There are multiple different genetic analyses used in PGD; examples include polymerase chain reaction (PCR), which can be used to determine the sex of the embryo and to detect single-gene disorders, and fluorescence in situ hybridization (FISH) and comparative genomic hybridization (CGH), which are used to detect chromosomal defects.
Few studies have enough participants to provide adequate statistical power, particularly in view of the multiple-testing inherent in genetic analyses.
Although smaller than the related Xenopus laevis, S. tropicalis has research advantages: diploidy and brief maturation time make this species ideal for genetic analyses over multiple generations (2 ).
In principle this method of gene discovery can lead to high-throughput expression and functional genetic analyses of multiple genes [see for example [ 17]].
This is in part due to their ease of culture, convenient size, short generation time and cyclic parthenogenetic reproduction, which make them very suitable for laboratory and field experiments, experimental evolution, and quantitative genetic analyses in multiple environments.
Molecular genetic analyses across multiple cichlid species are thus highly analogous to within-species polymorphism studies conducted in other organisms (e.g., humans, Chen and Rajewsky 2006; Saunders et al. 2007).
As such, studies are needed that incorporate multiple behavioural phenotypes into multivariate genetic analyses, allowing researchers to assess the extent to which behavioural measures together account for the heritability of environmental measures.
Our phylogenetic and population genetic analyses of multiple conservative loci within the microcystin synthetase (mcy) gene cluster suggested that mcy genes of M. aeruginosa are subdivided into two cryptic clades, which have been primarily generated and maintained as a result of homology-dependent recombination and neutral genetic drift.
However, more in-depth analyses involving multiple genetic loci are essential in order to delineate the origin and spread route of the CAS strains.
In organisms that have multiple family members, functional redundancy may complicate genetic analyses of ISG12 gene function, and multiple gene-knockouts or knockdowns may be required to reveal a clear phenotype.
