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

Solution

Two reasons for the appearance of variations among the progeny formed by sexual reproduction are :
i) Involvement of two different individuals - Since two individuals that is the male and female are involved therefore there will be more number of variation. The offspring acquires half genetic material from the father and half from the mother. So, the combination of various traits results in the variation in the offspring due to which the offspring is different from both the parents.

ii) Crossing over is the process in which the DNA is exchanged between the homologous chromosomes during meiosis.This causes variations in the cells.

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

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