HR0124 101ST GENERAL ASSEMBLY

HR0124 LRB101 06857 ALS 51888 r

HOUSE RESOLUTION

WHEREAS, A trisomy is a type of polysomy in which there are three instances of a particular chromosome, instead of the normal two; a trisomy is a type of aneuploidy, an abnormal number of chromosomes; and

WHEREAS, Most organisms have pairs of chromosomes in each cell, with one chromosome inherited from each parent; in such organisms, a process called meiosis creates cells called gametes that have only one set of chromosomes; and

WHEREAS, The number of chromosomes is different for different species; humans have 46 chromosomes, or 23 pairs of chromosomes, and human gametes have only 23 chromosomes; and

WHEREAS, If the chromosome pairs fail to separate properly during cell division, the egg or sperm may end up with a second copy of one of the chromosomes; if such a gamete results in fertilization and an embryo, the resulting embryo may also have an entire copy of the extra chromosome; and

WHEREAS, Full trisomy, also called primary trisomy, means that an entire extra chromosome has been copied; partial trisomy means that there is an extra copy of part of a chromosome; secondary trisomy means the extra chromosome has quadruplicated arms; tertiary trisomy means the extra chromosome is made up of copies of arms from two other chromosomes; and

WHEREAS, Trisomies can occur with any chromosome but often result in a miscarriage, rather than a live birth; and

WHEREAS, Trisomy 16 is the most common trisomy in human pregnancies, occurring in more than one percent of pregnancies; and

WHEREAS, Pregnancies in which some normal cells occur in addition to the trisomic cells, or mosaic trisomy 16, survive; this condition, however, usually results in a spontaneous miscarriage in the first trimester; and

WHEREAS, The most common types of autosomal trisomy that survive to birth in humans are Trisomy 21 (Down syndrome), Trisomy 18 (Edwards syndrome), Trisomy 13 (Patau syndrome), and Trisomy 8 (Warkany syndrome 2); therefore, be it

RESOLVED, BY THE HOUSE OF REPRESENTATIVES OF THE ONE HUNDRED FIRST GENERAL ASSEMBLY OF THE STATE OF ILLINOIS, that we declare the month of March 2019 as Trisomy Awareness Month in the State of Illinois, and we urge all citizens of this State to become aware of the different types of Trisomy; and be it further

RESOLVED, That suitable copies of this resolution be presented to Governor J.B. Pritzker and all Illinois Constitutional officers.