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Segregation of mendelian factor (Aa) occurs during

1. Diplotene
2. Anaphase I
3. Zygotene/Pachytene
4. Anaphase II

Correct answer: Anaphase I

Solution

Segregation of a Mendelian factor in a heterozygote (Aa) happens when the two alleles are carried on homologous chromosomes and those homologs separate during meiosis I. This occurs at anaphase I, so each daughter cell receives only one allele.

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