Who is a recessives allele different from a dominant allele

recessive allele requires two alleles for manifestation while a dominant allele manifests even in heterozygous condition

it creates acid rain

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.