Astacus trowbridgii (Crayfish, 2n=376): Niiyama (1962)
Niiyama, Annotationes Zoologicae Japonenses (1962)
On the unprecedentedly large number of chromosomes of the crayfish,Astacus trowbridgii Stimpson
Astacus trowbridgii (Crayfish) 2n=376
https://gyazo.com/0618cc190bc3a410ad8b1cf8f3c97f48
https://gyazo.com/990ebbfcfd1af08cd5be0e94a7e43340
Figure
mitosis
chromosome
number
spermatogonia
2n=376
34 (17 pairs) were metacentric.
342 were actocentric.
My Questions:
There are many chromosomes so they have to be paired at meiosis to make the tension between homolog chromosomes. In such kind of case, homolog chromosomes can get close together and make the pairing without any interlocks within the reasonable time scale? How can cell manage such extreame homology search in the cell?