The three characteristics that describe the genetic code of humans from the options provided are:
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Can help in development of effective medications - Understanding the genetic code can lead to the development of targeted therapies and personalized medicine.
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Can help explain genetic diseases - Analyzing the human genetic code can help identify mutations and genetic disorders, providing insight into the causes of various diseases.
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Composed of 23 chromosomes - Humans have 23 pairs of chromosomes, which comprise their genetic material.
The option stating "composed of about 19,000 genes" is slightly inaccurate; while the human genome has approximately 20,000-25,000 genes, the range indicated is not the commonly accepted figure. The correct number of genes is subject to ongoing research and may vary as science progresses.