Cell Cycle and Mitosis Project
BY SIERRA AGUILAR AND SAMI WEERS
- the end of interphase
- directly precedes into mitosis stage
-DNA is completely replicated
-rapid cell growth
-protein synthesis during which the cell readies itself for mitosis
- its not as important or necessary but it is helpful
-has a checkpoint that proceeds to mitosis
-this checkpoint detects mutation, missing DNA, and extra DNA. it will also commit suicide called apoptosis
Down syndrome also called as trisomy 21 is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. Some symptoms include physical growth delays, characteristic facial features, and mild to moderate intellectual disability. Some other symptoms include a flat facial profile, almond shaped eyes with an upward slant, unusual eyelids (known as epicanthic folds), a flat nasal bridge, a prominent tongue, small ears, single crease on the palms of the hands (known as a palmar crease), smaller limbs, smaller body frame, and a small head. Even though they may have these characteristics, babies and children with Down syndrome may still look much like other family members.
It is due because abnormal cell division results in an extra chromosome 21 in each cell. Prior to or at conception, a pair of chromosomes 21 (in either the sperm or the egg) fails to separate. As the embryo develops, the extra chromosome is replicated in every cell of the body. At present, researchers are not sure what causes the presence of an extra chromosome 21. In a person with Down syndrome, each cell makes excess amounts of chemicals regulated by the chromosome 21 genes.
Mr .Terrazas notes about cell cycle