Meiosis causes variation through crossing-over and independent assortment of homologous chromosomes and chromatids, allowing better-adapted individuals to survive and reproduce, passing on beneficial genes and facilitating adaptation to changing environments.
Meioza cauzează variație prin crossing-over și asortarea independentă a cromozomilor omologi și a cromatidelor, permițând supraviețuirea și reproducerea indivizilor mai bine adaptați, transmitând genele benefice și permițând adaptarea la medii schimbătoare.
| Front | Describe how meiosis causes this variation and explain the advantage of variation to the species. (5 marks) |
|---|---|
| Back | 1.Crossing-over; [IGNORE any wrong ref. to timing] 2. Independent/random assortment/orientation/segregation of (homologous) chromosomes in meiosis I; 3. Independent/random assortment/orientation/segregation of chromatids in meiosis II; + Any three from: 4. Different adaptations / some better adapted; 5. Some survive / example described; 6. To reproduce; 7. Pass on gene/allele; 8. Allows for changing environment/different environment/example described; |
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