Down syndrome is characterized by cells having three copies of chromosome 21. as a somatic cell in an individual with down syndrome prepares to enter mitosis, how many chromatids would be present in the cell’s nucleus?

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which of the following would most directly interfere with sperm production? ingestion of a substance that mimicked inhibin interruption of sustentocytes' production of abp low sperm count use of synthetic steroids (testosterone)