Suppose that a mouse with black fur has both an
allele for black fur and an allele for white fur (Bb).
Based on this information, you can conclude that
the dominant allele must be for fur and
the recessive allele must be for * fur.

The black fur allele is dominant and the white fur allele is recessive

Explanation: The mouse is black, and the dominant allele will show up. It is still carrying the white fur allele but it is recessive.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.