-- card: 73993 from stack: in
-- bmap block id: 74969
-- flags: 0000
-- background id: 2665
-- name: 


-- part 1 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=158 top=314 right=336 bottom=258
-- title width / last selected line: 0
-- icon id / first selected line: 0 / 0
-- text alignment: 1
-- font id: 0
-- text size: 12
-- style flags: 0
-- line height: 16
-- part name: RETURN
----- HyperTalk script -----
on mouseUp
  go to card id 44003
end mouseUp




-- part contents for background part 1
----- text -----
NONDISJUNCTION

-- part contents for background part 2
----- text -----
Nondisjunction is seen in the autosomes where it produces a trisomic condition for the chromosome pair in question. For example, in the diagram at the right, a gamete with a non-disjoined 21st chromosome pair is fertilized by a normal germ cell to produce a zygote with the normal diploid chromosome number except for the 21st pair which is trisomic. In humans, this condition produces Down's syndrome and becomes a significant possibility when women have children toward the end of their child-bearing years. It seems that the normal mechanisms that assure a segregation of the 21st pair homologues into different gametes breaks down and the incidence of Down's infants rises.

-- part contents for background part 8
----- text -----
170