Once Joe understands this much, he asks for a better explanation of the Punnett square. Draw a new, more complete Punnett Square that includes the genotypes of both parents, labels to indicate which symbols represent the genetic makeup of eggs, sperm, or zygotes, thin arrows (→) to represent meiosis, and fat arrows (⇒) to represent an example of fertilization.

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.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

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