Answer: Down syndrome
Explanation: Karyotype analysis can reveal abnormalities, such as missing chromosomes, extra chromosomes, deletions, duplications, and translocations.
Crossing over.
crossing over is when the alleles cross over and pair up, resulting in the genotype for an offspring
Enzymes are biological catalysts. Substances that increase the rate of chemical reactions without being used up, through lowering activation energy of the reaction. Enzymes are basically proteins folded into complicated shapes that allow small molecules to fit in them.
Hope it helps.
the answer is biologicle catalyst