In meiosis, chromosomes shorten, thicken, and pair up as homologous pairs (bivalents), align at the equator, then homologous chromosomes separate to opposite poles, and in the second division, chromatids separate.
În meioză, cromozomii se scurtează, se îngroașă și se asociază în perechi omoloage (bivalenți), se aliniază la ecuator, apoi cromozomii omologi se separă spre poli opuși, iar în diviziunea a doua, cromatidele se separă.
| Front | Describe what happens to chromosomes in meiosis. (6 marks) |
|---|---|
| Back | 1. Chromosomes shorten/thicken/condense; 2. Chromosomes associate in homologous/(described) pairs / formation of bivalents / tetrads; 3. Crossing-over / chiasma formation; 4. Join to spindle (fibres) / moved by spindle;(*) 5. (At) equator/middle of cell;(*) 6. (join via) centromere / kinetochore;(*) 7. (Homologous) chromosomes move to opposite poles / chromosomes separate/move apart; (ALLOW „are pulled apart‟) 8. (Pairs of) chromatids separated in 2nd division; |
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