art F You decide to cross the reciprocal translocation strai

art F You decide to cross the reciprocal translocation strain to a pure (black, sepia) line to generate female F1 fies that are both translocaton heterozygotes and Bbss dhybrids. You then backcross these F, females to males from the pure (black sepia)Ine. This diagram shows synaptis in the F females. (In the diagram, normal chromosome ll: TI translocated chromosome with the chromosome l centromere NIll normal chromosome Ill TIl translocated chromosome with the chromosome Ill centromere.) You wish to recover several categories of F2fies. wtat event must occur to produce each category ofF2fies stedin the table below? Complete the table by dragging the labels to the correct locations. Labels can be used once, more than once, or not at all. (Note: CO crossover NCO no crossover, b allele on TIll s allele on TIII Region b Region a Gamete from Dihybrid Required Event at Required Event at b allele on TIII (CO2 or NCO?) s allele on Till B allele on TTII s allele on TI allele on NII s allele on N b allele on NII sepia, fully fertile s allele on N previous l of 4 retum assign

Solution

Reciprocal translocation is usually the exchange of genetic material between non-homologous chromosomes. As In the below diagram:

Crossing Over is the exchange of genetic material between homologous chromosomes resulting in recombinant chromosome during sexual reproduction.

In the given question the F1 female flies (BbSs dihybrids) translocation heterozygotes are produced when reciprocal translocation strain is crossed to pure black and sepia line (BBSS).
These females (BbSs) are backcrossed to pure black and sepia males (BBSS) to produce F2 progeny flies of following categories:

F2 progeny

black and semi-sterileRegion a:- Crossing Over- Label B allele on NII and s allele on NIII

Region b: - Non Crossing Over- Label B allele on TIII and s allele on TIII

sepia, fully fertile Region a:- Non Crossing Over- Label b allele on TIII and S allele on TIII

Region b: - Non Crossing Over-Label b allele on NII and S allele on NIII

(black and sepia), semi-sterile Region a:- Crossing Over- Label b allele on NII and s allele on NIII

Region b: - Crossing Over- Label b allele on TIII and s allele on TIII.