Each somatic cell in an individual with down syndrome contains chromosomes.

47 chromosomes. 46 is balanced, 45 is too few (the baby would be stillborn), and 48 is too many. 47, the baby will survive, but will have Down syndrome.

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.