-- card: 39425 from stack: in
-- bmap block id: 13120
-- flags: 0000
-- background id: 2665
-- name: 


-- part 1 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=159 top=314 right=336 bottom=334
-- 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: SYNAPTONEMAL COMPLEX
----- HyperTalk script -----
on mouseUp
  go to card id 11464
end mouseUp




-- part 2 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=431 top=288 right=310 bottom=482
-- 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: NEXT
----- HyperTalk script -----
on mouseUp
  go to next card
end mouseUp



-- part 3 (button)
-- low flags: 00
-- high flags: 8003
-- rect: left=264 top=285 right=308 bottom=314
-- 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: PREV.
----- HyperTalk script -----
on mouseUp
  go back
end mouseUp



-- part contents for background part 1
----- text -----
LINKAGE-CROSSING OVER

-- part contents for background part 2
----- text -----
On the right are two chromatids, each one represented by a double strand of DNA. The two gene loci are A and B and the numbers are reference points that delineate common loci between the two homologues. According to the White- house hypothesis, the first event in crossing over involves a close pairing of homologous regions on homologous chromosome pairs followed by a break on one of the DNA strands on each of the chromatids. Flip to the next card to see this. [Note that a large protein structure called the synaptonemal complex is built between members of a homologous chromosome pair and is believed to play some role in aligning the chromosomes properly so that the process proceeds without complications.] If you wish details on the synaptonemal complex, click on the appropriate button below. You will be returned to this card after reviewing the data. 

-- part contents for background part 8
----- text -----
122