Which process during meiosis results in new combinations of alleles on the same chromosome?

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Question

Which process during meiosis results in new combinations of alleles on the same chromosome?

Accepted Answer

Crossing over between non-sister chromatids — Crossing over occurs during prophase I when non-sister chromatids of homologous chromosomes exchange segments, creating new allele combinations on individual chromosomes. Independent assortment shuffles whole chromosomes, not alleles within them. DNA replication copies existing allele combinations without mixing them. Random fusion at fertilisation produces variation but does not alter allele combinations within chromosomes.

Answer

Replication of DNA before meiosis I

Answer

Crossing over between non-sister chromatids

Answer

Random fusion of gametes at fertilisation

Answer

Independent assortment of chromosomes

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