Video
A Consanguinous marriage is defined as a marriage between two individual's who are second cousins or closer. These individuals are more likely to both have genes for disorders that make their offspring unhealthy.
References
Video
What is Genetic and Phenotypic Diversity
Genetic diversity is the total number of genetic characteristics in the genetic make-up of a species. Species with higher genetic diversity are more adept at combating environmental or human caused changes. Phenotype is the observable physical characteristics of an organism, as determined by both genetic makeup and environmental influences.
References