What is meant by the following terms: homologous chromosomes, autosomes, Barr body, gene, gametogenesis, and exome? List the causes of Down syndrome, and describe its clinical manifestations. Explain...

What is meant by the following terms: homologous chromosomes, autosomes, Barr body, gene, gametogenesis, and exome?

List the causes of Down syndrome, and describe its clinical manifestations. Explain why it is important to identify a carrier of a 14/21 chromosome translocation.