1. A “combo of letters” or group of alleles that represent a gene is called the 2. The physical appearance of an allele or a “description” of looks is called the
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Phenotype is a description of your physical characteristics. ... The set of genes you carry (known as your genotype) is what determines your phenotype.

Explanation:

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.