Symbtoms of trisomy 18​

thin and frail babies with a weak cry.

feeding problems.

small head size with the back of the head prominent.

ears are usually low-set on the head.

mouth and jaw unusually small.

shortened sternum (breastbone)

about 90 percent of babies have heart defects.

clenched fists.

answer; i do believe that the correct answer is; ///mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis;

c. establishing proper sleep hygiene