An organism is heterozygous for a gene that follows Mendels law of dominance which allele will be expressed as its phenotype

The dominant allele

Explanation:

The dominant allele will be expressed because in a heterozygous genotype, the phenotype will always show the dominant gene (in Mendelian genetics)

This is because the dominant allele will dominate the recessive one and it will "mask" the recessive allele.

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.