The tetravalent synaptic structure and alternate and adjacent chromosome

The tetravalent synaptic structure and alternate and adjacent chromosome segregation in reciprocal balanced translocation heterozygotesThe tetravalent synaptic structure and alternate and adjacent chromosome segregation in reciprocal balanced translocation heterozygotes

Tetravalent complex Alternatesegregationk (-50%) l l IV II and ”+38 n , . Ill Ill . . IV Merosrs ll Merosrs ll Gametes . Im , l— , l— , I— . I— , n— , II— II ||.- ,_ m— Alternate segregation separates i Adjacent-1 segregation separates ’ Adjacent-2 segregation isvery rare homologous centromeres and produces normal gametes. homologous centromeres and produces nonviable gametes with duplications and deletions. because it does not separate homologous centromeres; gametes are nonviable due _ Io WWW and ween: Conclusion. Only alternate segregation produces viable gametes and progeny. This segregation pattern occurs in _ about half of meioses and accounts for semisterility of translocation heterozygotes.