Aperson with down syndrome has an additional #21 chromosome in every somatic cell. this condition is also called trisomy 21. the cause of this syndrome

The answer is C.) Is through the union of a normal gamete with a haploid amount of chromosomes (n) and another gamete with an extra #21 (n+1)

the answer to your question is slate

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.