Answer: Answer: Part B). The F2 progeny contain recombinants only when F1 females are test crossed; Some of the F2 progeny classes require crossing over; others do not. Chromosome ll is one of the chromosomes involved in the reciprocal balanced translocatio. Explanation: To produce phenotypes, sepi, fully fertile and wild-type, semi-sterile are not require crossing over while to produce phenotypes, sepia, semi-sterile and wile-type, fully fertile require crossing over. A balanced, or chromosomal translocation is a condition in which part of a chromosome has broken off and reattached in another location. In other words, it means that sections of two chromosomes have switched places. Solution Answer: Answer: Part B). The F2 progeny contain recombinants only when F1 females are test crossed; Some of the F2 progeny classes require crossing over; others do not. Chromosome ll is one of the chromosomes involved in the reciprocal balanced translocatio. Explanation: To produce phenotypes, sepi, fully fertile and wild-type, semi-sterile are not require crossing over while to produce phenotypes, sepia, semi-sterile and wile-type, fully fertile require crossing over. A balanced, or chromosomal translocation is a condition in which part of a chromosome has broken off and reattached in another location. In other words, it means that sections of two chromosomes have switched places..