Crossing-over, where equal lengths of non-sister chromatids are exchanged during homologous chromosome association (bivalents) through chiasmata formation, increases genetic diversity by creating new combinations of alleles.
Crossing-over-ul, unde porțiuni egale de cromatide non-surori sunt schimbate în timpul asociierii cromozomilor omologi (bivalenți) prin formarea chiasmelor, crește diversitatea genetică prin crearea de noi combinații de aleli.
| Front | Crossing over greatly increases genetic diversity in this species of moss. Describe the process of crossing over and explain how it increases genetic diversity. [4 marks] |
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| Back | 1. Homologous pairs of chromosomes associate / form a bivalent; 2. Chiasma(ta) form; 3. (Equal) lengths of (non-sister) chromatids / alleles are exchanged; 4. Producing new combinations of alleles; |
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