Drift can lead to loss of genetic variation within populations due to the chance loss of specific alleles. Gene flow is the transfer of alleles from one population to another, due to the migration of individuals or dispersal of gametes. Gene flow can bring new variation into local populations, but tends to reduce variations among seperate populations by homogenizing them. Australian Museum - pamphlet Mayidianne C. B. Andrade. Sexual Selection for Male Sacrifice in the Australian Redback Spider .
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Describe the similarities and differences between polyploidy, inversions and translocations. Rarely do these chromosomal mutations lead to changes in nucleotide sequences in individual genes. Describe how chromosomal inversions can lead to reduced gamete production by individuals that are heterozygous for the inversion. Distinguish between substitutions, deletions and insertions for point mutations. Describe how mobile genetic elements can randomly inactivate and reactivate alleles.