Mutation and sexual reproduction lead to genetic variation in a population.
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Meiosis is an early step in sexual reproduction in which the pairs of chromosomes separate and segregate randomly during cell division to produce gametes containing one chromosome of each type.
Only certain cells in a multicellular organism undergo meiosis.
Random chromosome segregation explains the probability that a particular allele will be in a gamete.
New combinations of alleles may be generated in a zygote through the fusion of male and female gametes (fertilization).
Approximately half of an individual’s DNA sequence comes from each parent.