The pedigree below shows the inheritance patterns of two extremely rare,independent genetic conditions (represented with black and grey symbols,respectively) .If individuals A and B have a child,what is the probability that it will have both conditions? 
Definitions:
Erikson
Psychologist Erik H. Erikson developed a theory of psychological development that identifies eight stages from infancy to adulthood, each characterized by a central conflict.
Continuous Development
A perspective on human development which sees changes as gradual and incremental, without sudden shifts or distinct stages.
Discontinuous Development
The concept that development occurs in distinct stages that are qualitatively different from each other rather than as a smooth, continuous progression.
Nature
The inherent qualities or characteristics of a person or thing; frequently contrasted with nurture, or environmental influences.
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