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  • Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.

Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.

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1. The primary cause is the crossover of homologous chromosomes, which creates a recombinant variation in the DNA of the progeny at the pachytene stage of prophase-1 (homologous recombination stage) of meiosis-1 (reductional cell division).
2. The fact that sexual reproduction entails the creation of children by two parents is the second important factor. Therefore, the mother and father's varied gene sets are the cause of the offspring's variety.
3. Due to the error-prone nature of DNA replication, sexual reproduction produces more viable variants in the progeny.

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