what is it called when genetic information is exchanged between homologous chromosomes during prophase 1?

the process is called crossing over, which is responsible for genetic variation

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.

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